815604489 has 24 divisors (see below), whose sum is σ = 1375046400. Its totient is φ = 456141888.

The previous prime is 815604463. The next prime is 815604499. The reversal of 815604489 is 984406518.

815604489 is a `hidden beast` number, since 8 + 1 + 560 + 4 + 4 + 89 = 666.

It is not a de Polignac number, because 815604489 - 2¹¹ = 815602441 is a prime.

It is a super-2 number, since 2×815604489² = 1330421364953902242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (815604499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134764 + ... + 140685.

It is an arithmetic number, because the mean of its divisors is an integer number (57293600).

Almost surely, 2^815604489 is an apocalyptic number.

It is an amenable number.

815604489 is a deficient number, since it is larger than the sum of its proper divisors (559441911).

815604489 is a wasteful number, since it uses less digits than its factorization.

815604489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275509 (or 275506 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 815604489 is about 28558.7900478994. The cubic root of 815604489 is about 934.3147443595.

The spelling of 815604489 in words is "eight hundred fifteen million, six hundred four thousand, four hundred eighty-nine".