23137728 has 56 divisors (see below), whose sum is σ = 62892432. Its totient is φ = 7501824.

The previous prime is 23137721. The next prime is 23137753. The reversal of 23137728 is 82773132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23137721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5476 + ... + 8732.

Almost surely, 2^23137728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23137728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31446216).

23137728 is an abundant number, since it is smaller than the sum of its proper divisors (39754704).

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

23137728 is a wasteful number, since it uses less digits than its factorization.

23137728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309 (or 3299 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 23137728 is about 4810.1692277923. The cubic root of 23137728 is about 284.9532210080.

The spelling of 23137728 in words is "twenty-three million, one hundred thirty-seven thousand, seven hundred twenty-eight".