816865290 has 64 divisors (see below), whose sum is σ = 2292969600. Its totient is φ = 206364672.

The previous prime is 816865267. The next prime is 816865307. The reversal of 816865290 is 92568618.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74487 + ... + 84746.

It is an arithmetic number, because the mean of its divisors is an integer number (35827650).

Almost surely, 2^816865290 is an apocalyptic number.

816865290 is an abundant number, since it is smaller than the sum of its proper divisors (1476104310).

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

816865290 is a wasteful number, since it uses less digits than its factorization.

816865290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159268 (or 159262 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 816865290 is about 28580.8553056062. The cubic root of 816865290 is about 934.7959328543.

The spelling of 816865290 in words is "eight hundred sixteen million, eight hundred sixty-five thousand, two hundred ninety".