764685438 has 64 divisors (see below), whose sum is σ = 1803790080. Its totient is φ = 213580800.

The previous prime is 764685421. The next prime is 764685491. The reversal of 764685438 is 834586467.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38158 + ... + 54638.

It is an arithmetic number, because the mean of its divisors is an integer number (28184220).

Almost surely, 2^764685438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 764685438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901895040).

764685438 is an abundant number, since it is smaller than the sum of its proper divisors (1039104642).

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

764685438 is a wasteful number, since it uses less digits than its factorization.

764685438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16553.

The product of its digits is 3870720, while the sum is 51.

The square root of 764685438 is about 27652.9462806407. The cubic root of 764685438 is about 914.4520545031.

The spelling of 764685438 in words is "seven hundred sixty-four million, six hundred eighty-five thousand, four hundred thirty-eight".