764686728 has 192 divisors, whose sum is σ = 2315476800. Its totient is φ = 226506240.

The previous prime is 764686723. The next prime is 764686739. The reversal of 764686728 is 827686467.

It is not an unprimeable number, because it can be changed into a prime (764686721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3368551 + ... + 3368777.

It is an arithmetic number, because the mean of its divisors is an integer number (12059775).

Almost surely, 2^764686728 is an apocalyptic number.

764686728 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 764686728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157738400).

764686728 is an abundant number, since it is smaller than the sum of its proper divisors (1550790072).

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

764686728 is a wasteful number, since it uses less digits than its factorization.

764686728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 365 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The square root of 764686728 is about 27652.9696054511. The cubic root of 764686728 is about 914.4525687200.

The spelling of 764686728 in words is "seven hundred sixty-four million, six hundred eighty-six thousand, seven hundred twenty-eight".