764238875688 has 80 divisors (see below), whose sum is σ = 2160214996500. Its totient is φ = 252409146624.

The previous prime is 764238875593. The next prime is 764238875783. The reversal of 764238875688 is 886578832467.

764238875688 is a `hidden beast` number, since 76 + 423 + 8 + 8 + 7 + 56 + 88 = 666.

It is an interprime number because it is at equal distance from previous prime (764238875593) and next prime (764238875783).

It can be written as a sum of positive squares in 2 ways, for example, as 757704093444 + 6534782244 = 870462^2 + 80838^2 .

It is a super-2 number, since 2×764238875688² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5339373 + ... + 5480636.

Almost surely, 2^764238875688 is an apocalyptic number.

It is an amenable number.

764238875688 is an abundant number, since it is smaller than the sum of its proper divisors (1395976120812).

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

764238875688 is a wasteful number, since it uses less digits than its factorization.

764238875688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10820136 (or 10820123 counting only the distinct ones).

The product of its digits is 867041280, while the sum is 72.

The spelling of 764238875688 in words is "seven hundred sixty-four billion, two hundred thirty-eight million, eight hundred seventy-five thousand, six hundred eighty-eight".