64855680 has 128 divisors (see below), whose sum is σ = 218998080. Its totient is φ = 16269312.

The previous prime is 64855667. The next prime is 64855711. The reversal of 64855680 is 8655846.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31647 + ... + 33633.

Almost surely, 2^64855680 is an apocalyptic number.

64855680 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 64855680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109499040).

64855680 is an abundant number, since it is smaller than the sum of its proper divisors (154142400).

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

64855680 is a wasteful number, since it uses less digits than its factorization.

64855680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026 (or 2014 counting only the distinct ones).

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

The square root of 64855680 is about 8053.3024281968. The cubic root of 64855680 is about 401.7747804065.

The spelling of 64855680 in words is "sixty-four million, eight hundred fifty-five thousand, six hundred eighty".