23455640 has 64 divisors (see below), whose sum is σ = 58212000. Its totient is φ = 8451072.

The previous prime is 23455639. The next prime is 23455657. The reversal of 23455640 is 4655432.

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, 21836 + ... + 22884.

Almost surely, 2^23455640 is an apocalyptic number.

23455640 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 23455640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29106000).

23455640 is an abundant number, since it is smaller than the sum of its proper divisors (34756360).

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

23455640 is a wasteful number, since it uses less digits than its factorization.

23455640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 23455640 is about 4843.1023115354. The cubic root of 23455640 is about 286.2523731235.

The spelling of 23455640 in words is "twenty-three million, four hundred fifty-five thousand, six hundred forty".