64875728 has 20 divisors (see below), whose sum is σ = 132312960. Its totient is φ = 30730464.

The previous prime is 64875721. The next prime is 64875737. The reversal of 64875728 is 82757846.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64875721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106400 + ... + 107007.

It is an arithmetic number, because the mean of its divisors is an integer number (6615648).

Almost surely, 2^64875728 is an apocalyptic number.

It is an amenable number.

64875728 is an abundant number, since it is smaller than the sum of its proper divisors (67437232).

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

64875728 is a wasteful number, since it uses less digits than its factorization.

64875728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213434 (or 213428 counting only the distinct ones).

The product of its digits is 752640, while the sum is 47.

The square root of 64875728 is about 8054.5470387850. The cubic root of 64875728 is about 401.8161746272.

The spelling of 64875728 in words is "sixty-four million, eight hundred seventy-five thousand, seven hundred twenty-eight".