764695728 has 60 divisors (see below), whose sum is σ = 2219359688. Its totient is φ = 254897280.

The previous prime is 764695721. The next prime is 764695739. The reversal of 764695728 is 827596467.

764695728 is a `hidden beast` number, since 7 + 6 + 4 + 69 + 572 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (764695721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94453 + ... + 102228.

Almost surely, 2^764695728 is an apocalyptic number.

It is an amenable number.

764695728 is an abundant number, since it is smaller than the sum of its proper divisors (1454663960).

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

764695728 is a wasteful number, since it uses less digits than its factorization.

764695728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196704 (or 196686 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 764695728 is about 27653.1323361387. The cubic root of 764695728 is about 914.4561562635.

The spelling of 764695728 in words is "seven hundred sixty-four million, six hundred ninety-five thousand, seven hundred twenty-eight".