23557240 has 128 divisors (see below), whose sum is σ = 66096000. Its totient is φ = 7526400.

The previous prime is 23557231. The next prime is 23557243. The reversal of 23557240 is 4275532.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 23557199 and 23557208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23557243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233190 + ... + 233290.

It is an arithmetic number, because the mean of its divisors is an integer number (516375).

Almost surely, 2^23557240 is an apocalyptic number.

23557240 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 23557240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33048000).

23557240 is an abundant number, since it is smaller than the sum of its proper divisors (42538760).

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

23557240 is a wasteful number, since it uses less digits than its factorization.

23557240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 23557240 is about 4853.5801219306. The cubic root of 23557240 is about 286.6650862241.

It can be divided in two parts, 235 and 57240, that added together give a palindrome (57475).

The spelling of 23557240 in words is "twenty-three million, five hundred fifty-seven thousand, two hundred forty".