823900090 has 64 divisors (see below), whose sum is σ = 1657184256. Its totient is φ = 292937472.

The previous prime is 823900067. The next prime is 823900111. The reversal of 823900090 is 90009328.

It is a happy number.

It is a super-2 number, since 2×823900090² = 1357622716604016200, which contains 22 as substring.

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, 494599 + ... + 496261.

It is an arithmetic number, because the mean of its divisors is an integer number (25893504).

Almost surely, 2^823900090 is an apocalyptic number.

823900090 is an abundant number, since it is smaller than the sum of its proper divisors (833284166).

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

823900090 is a wasteful number, since it uses less digits than its factorization.

823900090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 823900090 is about 28703.6598711732. The cubic root of 823900090 is about 937.4717369850.

The spelling of 823900090 in words is "eight hundred twenty-three million, nine hundred thousand, ninety".