22715640 has 224 divisors, whose sum is σ = 82630800. Its totient is φ = 5598720.

The previous prime is 22715639. The next prime is 22715687. The reversal of 22715640 is 4651722.

22715640 is a `hidden beast` number, since 2 + 2 + 7 + 15 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 554020 + ... + 554060.

Almost surely, 2^22715640 is an apocalyptic number.

22715640 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 22715640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41315400).

22715640 is an abundant number, since it is smaller than the sum of its proper divisors (59915160).

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

22715640 is a wasteful number, since it uses less digits than its factorization.

22715640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 22715640 is about 4766.0927393411. The cubic root of 22715640 is about 283.2098316035.

The spelling of 22715640 in words is "twenty-two million, seven hundred fifteen thousand, six hundred forty".