23991228 has 30 divisors (see below), whose sum is σ = 62718656. Its totient is φ = 7996968.

The previous prime is 23991223. The next prime is 23991259. The reversal of 23991228 is 82219932.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 23991192 and 23991201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23991221) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36700 + ... + 37347.

Almost surely, 2^23991228 is an apocalyptic number.

It is an amenable number.

23991228 is an abundant number, since it is smaller than the sum of its proper divisors (38727428).

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

23991228 is a wasteful number, since it uses less digits than its factorization.

23991228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74063 (or 74052 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 23991228 is about 4898.0841152434. The cubic root of 23991228 is about 288.4147669645.

The spelling of 23991228 in words is "twenty-three million, nine hundred ninety-one thousand, two hundred twenty-eight".