23428656 has 80 divisors (see below), whose sum is σ = 67837920. Its totient is φ = 7741440.

The previous prime is 23428621. The next prime is 23428661. The reversal of 23428656 is 65682432.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 23428656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83236 + ... + 83516.

It is an arithmetic number, because the mean of its divisors is an integer number (847974).

Almost surely, 2^23428656 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 23428656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33918960).

23428656 is an abundant number, since it is smaller than the sum of its proper divisors (44409264).

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

23428656 is a wasteful number, since it uses less digits than its factorization.

23428656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 479 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 23428656 is about 4840.3156921837. The cubic root of 23428656 is about 286.1425601888.

The spelling of 23428656 in words is "twenty-three million, four hundred twenty-eight thousand, six hundred fifty-six".