64728328 has 16 divisors (see below), whose sum is σ = 138703680. Its totient is φ = 27740688.

The previous prime is 64728311. The next prime is 64728331. The reversal of 64728328 is 82382746.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577876 + ... + 577987.

It is an arithmetic number, because the mean of its divisors is an integer number (8668980).

Almost surely, 2^64728328 is an apocalyptic number.

It is an amenable number.

64728328 is an abundant number, since it is smaller than the sum of its proper divisors (73975352).

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

64728328 is a wasteful number, since it uses less digits than its factorization.

64728328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155876 (or 1155872 counting only the distinct ones).

The product of its digits is 129024, while the sum is 40.

The square root of 64728328 is about 8045.3917244594. The cubic root of 64728328 is about 401.5116302390.

It can be divided in two parts, 64728 and 328, that added together give a palindrome (65056).

The spelling of 64728328 in words is "sixty-four million, seven hundred twenty-eight thousand, three hundred twenty-eight".