65544240 has 80 divisors (see below), whose sum is σ = 208174176. Its totient is φ = 17049600.

The previous prime is 65544233. The next prime is 65544247. The reversal of 65544240 is 4244556.

It is an interprime number because it is at equal distance from previous prime (65544233) and next prime (65544247).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 65544198 and 65544207.

It is not an unprimeable number, because it can be changed into a prime (65544247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6510 + ... + 13170.

Almost surely, 2^65544240 is an apocalyptic number.

65544240 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 65544240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104087088).

65544240 is an abundant number, since it is smaller than the sum of its proper divisors (142629936).

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

65544240 is a wasteful number, since it uses less digits than its factorization.

65544240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718 (or 6712 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 65544240 is about 8095.9397230958. The cubic root of 65544240 is about 403.1916326369.

Adding to 65544240 its reverse (4244556), we get a palindrome (69788796).

The spelling of 65544240 in words is "sixty-five million, five hundred forty-four thousand, two hundred forty".