23691090 has 32 divisors (see below), whose sum is σ = 57185856. Its totient is φ = 6281280.

The previous prime is 23691079. The next prime is 23691097. The reversal of 23691090 is 9019632.

It is a super-2 number, since 2×23691090² = 1122535490776200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (23691097) 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, 3249 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (1787058).

Almost surely, 2^23691090 is an apocalyptic number.

23691090 is an abundant number, since it is smaller than the sum of its proper divisors (33494766).

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

23691090 is a wasteful number, since it uses less digits than its factorization.

23691090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 23691090 is about 4867.3493813368. The cubic root of 23691090 is about 287.2069957535.

The spelling of 23691090 in words is "twenty-three million, six hundred ninety-one thousand, ninety".