64728056 has 8 divisors (see below), whose sum is σ = 121365120. Its totient is φ = 32364024.

The previous prime is 64728047. The next prime is 64728067. The reversal of 64728056 is 65082746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4045496 + ... + 4045511.

It is an arithmetic number, because the mean of its divisors is an integer number (15170640).

Almost surely, 2^64728056 is an apocalyptic number.

It is an amenable number.

64728056 is a deficient number, since it is larger than the sum of its proper divisors (56637064).

64728056 is a wasteful number, since it uses less digits than its factorization.

64728056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8091013 (or 8091009 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 64728056 is about 8045.3748203549. The cubic root of 64728056 is about 401.5110678303.

The spelling of 64728056 in words is "sixty-four million, seven hundred twenty-eight thousand, fifty-six".