23537640 has 96 divisors (see below), whose sum is σ = 82162080. Its totient is φ = 5378688.

The previous prime is 23537629. The next prime is 23537651. The reversal of 23537640 is 4673532.

It is an interprime number because it is at equal distance from previous prime (23537629) and next prime (23537651).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 23537598 and 23537607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3879 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (855855).

Almost surely, 2^23537640 is an apocalyptic number.

23537640 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 23537640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41081040).

23537640 is an abundant number, since it is smaller than the sum of its proper divisors (58624440).

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

23537640 is a wasteful number, since it uses less digits than its factorization.

23537640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031 (or 4020 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 23537640 is about 4851.5605736711. The cubic root of 23537640 is about 286.5855608542.

The spelling of 23537640 in words is "twenty-three million, five hundred thirty-seven thousand, six hundred forty".