23191728 has 80 divisors (see below), whose sum is σ = 71471616. Its totient is φ = 6336000.

The previous prime is 23191717. The next prime is 23191739. The reversal of 23191728 is 82719132.

It is an interprime number because it is at equal distance from previous prime (23191717) and next prime (23191739).

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, 6228 + ... + 9228.

Almost surely, 2^23191728 is an apocalyptic number.

23191728 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 23191728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35735808).

23191728 is an abundant number, since it is smaller than the sum of its proper divisors (48279888).

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

23191728 is a wasteful number, since it uses less digits than its factorization.

23191728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042 (or 3036 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 23191728 is about 4815.7790646997. The cubic root of 23191728 is about 285.1747281895.

The spelling of 23191728 in words is "twenty-three million, one hundred ninety-one thousand, seven hundred twenty-eight".