23286640 has 40 divisors (see below), whose sum is σ = 58308768. Its totient is φ = 8597760.

The previous prime is 23286619. The next prime is 23286643. The reversal of 23286640 is 4668232.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23286643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10156 + ... + 12235.

Almost surely, 2^23286640 is an apocalyptic number.

23286640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23286640 is an abundant number, since it is smaller than the sum of its proper divisors (35022128).

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

23286640 is a wasteful number, since it uses less digits than its factorization.

23286640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22417 (or 22411 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 23286640 is about 4825.6232758059. The cubic root of 23286640 is about 285.5632239548.

The spelling of 23286640 in words is "twenty-three million, two hundred eighty-six thousand, six hundred forty".