23026640 has 80 divisors (see below), whose sum is σ = 65912448. Its totient is φ = 7285248.

The previous prime is 23026631. The next prime is 23026699. The reversal of 23026640 is 4662032.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×23026640² = 1060452299379200, which contains 22 as substring.

It is a congruent number.

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, 5699 + ... + 8861.

Almost surely, 2^23026640 is an apocalyptic number.

23026640 is a gapful number since it is divisible by the number (20) 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 23026640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32956224).

23026640 is an abundant number, since it is smaller than the sum of its proper divisors (42885808).

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

23026640 is a wasteful number, since it uses less digits than its factorization.

23026640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3190 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 23026640 is about 4798.6081315315. The cubic root of 23026640 is about 284.4964536155.

Adding to 23026640 its reverse (4662032), we get a palindrome (27688672).

The spelling of 23026640 in words is "twenty-three million, twenty-six thousand, six hundred forty".