23391228 has 48 divisors (see below), whose sum is σ = 63660800. Its totient is φ = 6682032.

The previous prime is 23391211. The next prime is 23391257. The reversal of 23391228 is 82219332.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 23391195 and 23391204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275 + ... + 6957.

Almost surely, 2^23391228 is an apocalyptic number.

23391228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23391228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31830400).

23391228 is an abundant number, since it is smaller than the sum of its proper divisors (40269572).

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

23391228 is a wasteful number, since it uses less digits than its factorization.

23391228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5711 (or 5695 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 23391228 is about 4836.4478700799. The cubic root of 23391228 is about 285.9901051233.

The spelling of 23391228 in words is "twenty-three million, three hundred ninety-one thousand, two hundred twenty-eight".