815722472 has 16 divisors (see below), whose sum is σ = 1529841060. Its totient is φ = 407764864.

The previous prime is 815722471. The next prime is 815722477. The reversal of 815722472 is 274227518.

It can be written as a sum of positive squares in 2 ways, for example, as 484264036 + 331458436 = 22006^2 + 18206^2 .

It is not an unprimeable number, because it can be changed into a prime (815722471) 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, 34508 + ... + 53124.

Almost surely, 2^815722472 is an apocalyptic number.

It is an amenable number.

815722472 is a deficient number, since it is larger than the sum of its proper divisors (714118588).

815722472 is a wasteful number, since it uses less digits than its factorization.

815722472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24100 (or 24096 counting only the distinct ones).

The product of its digits is 62720, while the sum is 38.

The square root of 815722472 is about 28560.8555894252. The cubic root of 815722472 is about 934.3597939487.

The spelling of 815722472 in words is "eight hundred fifteen million, seven hundred twenty-two thousand, four hundred seventy-two".