23387728 has 40 divisors (see below), whose sum is σ = 55774208. Its totient is φ = 9251712.

The previous prime is 23387719. The next prime is 23387731. The reversal of 23387728 is 82778332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6576 + ... + 9487.

Almost surely, 2^23387728 is an apocalyptic number.

23387728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

23387728 is an abundant number, since it is smaller than the sum of its proper divisors (32386480).

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

23387728 is a wasteful number, since it uses less digits than its factorization.

23387728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16091 (or 16085 counting only the distinct ones).

The product of its digits is 112896, while the sum is 40.

The square root of 23387728 is about 4836.0860207403. The cubic root of 23387728 is about 285.9758402987.

The spelling of 23387728 in words is "twenty-three million, three hundred eighty-seven thousand, seven hundred twenty-eight".