815138264 has 16 divisors (see below), whose sum is σ = 1581087600. Its totient is φ = 393514912.

The previous prime is 815138243. The next prime is 815138267. The reversal of 815138264 is 462831518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815138267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1756532 + ... + 1756995.

It is an arithmetic number, because the mean of its divisors is an integer number (98817975).

Almost surely, 2^815138264 is an apocalyptic number.

It is an amenable number.

815138264 is a deficient number, since it is larger than the sum of its proper divisors (765949336).

815138264 is a wasteful number, since it uses less digits than its factorization.

815138264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513562 (or 3513558 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 815138264 is about 28550.6263328845. The cubic root of 815138264 is about 934.1366825968.

The spelling of 815138264 in words is "eight hundred fifteen million, one hundred thirty-eight thousand, two hundred sixty-four".