23012990 has 128 divisors (see below), whose sum is σ = 59028480. Its totient is φ = 6272640.

The previous prime is 23012963. The next prime is 23012993. The reversal of 23012990 is 9921032.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23012993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1211201 + ... + 1211219.

It is an arithmetic number, because the mean of its divisors is an integer number (461160).

Almost surely, 2^23012990 is an apocalyptic number.

23012990 is an abundant number, since it is smaller than the sum of its proper divisors (36015490).

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

23012990 is a wasteful number, since it uses less digits than its factorization.

23012990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 23012990 is about 4797.1856332646. The cubic root of 23012990 is about 284.4402267961.

23012990 divided by its sum of digits (26) gives a triangular number (885115 = T₁₃₃₀).

The spelling of 23012990 in words is "twenty-three million, twelve thousand, nine hundred ninety".