65563680 has 384 divisors, whose sum is σ = 270950400. Its totient is φ = 12939264.

The previous prime is 65563669. The next prime is 65563681. The reversal of 65563680 is 8636556.

It is a super-2 number, since 2×65563680² = 8597192270284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65563681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 829881 + ... + 829959.

It is an arithmetic number, because the mean of its divisors is an integer number (705600).

Almost surely, 2^65563680 is an apocalyptic number.

65563680 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 65563680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135475200).

65563680 is an abundant number, since it is smaller than the sum of its proper divisors (205386720).

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

65563680 is a wasteful number, since it uses less digits than its factorization.

65563680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 65563680 is about 8097.1402359105. The cubic root of 65563680 is about 403.2314900450.

The spelling of 65563680 in words is "sixty-five million, five hundred sixty-three thousand, six hundred eighty".