864937728 has 54 divisors (see below), whose sum is σ = 2493835344. Its totient is φ = 288311808.

The previous prime is 864937693. The next prime is 864937729. The reversal of 864937728 is 827739468.

864937728 is a `hidden beast` number, since 86 + 493 + 7 + 72 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864937729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185400 + ... + 190007.

It is an arithmetic number, because the mean of its divisors is an integer number (46182136).

Almost surely, 2^864937728 is an apocalyptic number.

It is an amenable number.

864937728 is an abundant number, since it is smaller than the sum of its proper divisors (1628897616).

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

864937728 is a wasteful number, since it uses less digits than its factorization.

864937728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375429 (or 375412 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 864937728 is about 29409.8236648913. The cubic root of 864937728 is about 952.7850784526.

The spelling of 864937728 in words is "eight hundred sixty-four million, nine hundred thirty-seven thousand, seven hundred twenty-eight".