815664090 has 16 divisors (see below), whose sum is σ = 1957593888. Its totient is φ = 217510416.

The previous prime is 815664079. The next prime is 815664133. The reversal of 815664090 is 90466518.

815664090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13594372 + ... + 13594431.

It is an arithmetic number, because the mean of its divisors is an integer number (122349618).

Almost surely, 2^815664090 is an apocalyptic number.

815664090 is an abundant number, since it is smaller than the sum of its proper divisors (1141929798).

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

815664090 is a wasteful number, since it uses less digits than its factorization.

815664090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27188813.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 815664090 is about 28559.8335079181. The cubic root of 815664090 is about 934.3375024232.

The spelling of 815664090 in words is "eight hundred fifteen million, six hundred sixty-four thousand, ninety".