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BaseRepresentation
bin1111111111110000
310022212200
433333300
54044040
61223200
7362010
oct177760
9108780
1065520
1145254
1231b00
1323a90
1419c40
1514630
hexfff0

65520 has 120 divisors (see below), whose sum is σ = 270816. Its totient is φ = 13824.

The previous prime is 65519. The next prime is 65521. The reversal of 65520 is 2556.

65520 is nontrivially palindromic in base 11.

It is an interprime number because it is at equal distance from previous prime (65519) and next prime (65521).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a nialpdrome in base 2, base 4, base 10 and base 16.

It is a zygodrome in base 2 and base 4.

It is a junction number, because it is equal to n+sod(n) for n = 65493 and 65502.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 65 × 63 × 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5034 + ... + 5046.

265520 is an apocalyptic number.

65520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135408).

65520 is an abundant number, since it is smaller than the sum of its proper divisors (205296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65520 is a wasteful number, since it uses less digits than its factorization.

65520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 65520 is about 255.9687480924. The cubic root of 65520 is about 40.3141922852.

It can be divided in two parts, 65 and 520, that added together give a palindrome (585).

The spelling of 65520 in words is "sixty-five thousand, five hundred twenty".