23421528 has 128 divisors (see below), whose sum is σ = 73920000. Its totient is φ = 6811776.

The previous prime is 23421511. The next prime is 23421533. The reversal of 23421528 is 82512432.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53133 + ... + 53571.

It is an arithmetic number, because the mean of its divisors is an integer number (577500).

Almost surely, 2^23421528 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 23421528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36960000).

23421528 is an abundant number, since it is smaller than the sum of its proper divisors (50498472).

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

23421528 is a wasteful number, since it uses less digits than its factorization.

23421528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 476 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 23421528 is about 4839.5793205608. The cubic root of 23421528 is about 286.1135383071.

The spelling of 23421528 in words is "twenty-three million, four hundred twenty-one thousand, five hundred twenty-eight".