815604490 has 32 divisors (see below), whose sum is σ = 1489617360. Its totient is φ = 321490944.

The previous prime is 815604463. The next prime is 815604499. The reversal of 815604490 is 94406518.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 224190729 + 591413761 = 14973^2 + 24319^2 .

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 15 ways as a sum of consecutive naturals, for example, 208432 + ... + 212308.

Almost surely, 2^815604490 is an apocalyptic number.

815604490 is a deficient number, since it is larger than the sum of its proper divisors (674012870).

815604490 is a wasteful number, since it uses less digits than its factorization.

815604490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 815604490 is about 28558.7900654072. The cubic root of 815604490 is about 934.3147447414.

The spelling of 815604490 in words is "eight hundred fifteen million, six hundred four thousand, four hundred ninety".