23138628 has 12 divisors (see below), whose sum is σ = 53990160. Its totient is φ = 7712872.

The previous prime is 23138623. The next prime is 23138659. The reversal of 23138628 is 82683132.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×23138628² = 1070792211444768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23138623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964098 + ... + 964121.

It is an arithmetic number, because the mean of its divisors is an integer number (4499180).

Almost surely, 2^23138628 is an apocalyptic number.

It is an amenable number.

23138628 is an abundant number, since it is smaller than the sum of its proper divisors (30851532).

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

23138628 is a wasteful number, since it uses less digits than its factorization.

23138628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928226 (or 1928224 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 23138628 is about 4810.2627786848. The cubic root of 23138628 is about 284.9569156170.

The spelling of 23138628 in words is "twenty-three million, one hundred thirty-eight thousand, six hundred twenty-eight".