65564880 has 40 divisors (see below), whose sum is σ = 203251872. Its totient is φ = 17483904.

The previous prime is 65564867. The next prime is 65564909. The reversal of 65564880 is 8846556.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136354 + ... + 136833.

Almost surely, 2^65564880 is an apocalyptic number.

65564880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65564880 is an abundant number, since it is smaller than the sum of its proper divisors (137686992).

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

65564880 is a wasteful number, since it uses less digits than its factorization.

65564880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273203 (or 273197 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 65564880 is about 8097.2143358071. The cubic root of 65564880 is about 403.2339501206.

The spelling of 65564880 in words is "sixty-five million, five hundred sixty-four thousand, eight hundred eighty".