22640913 has 12 divisors (see below), whose sum is σ = 34425040. Its totient is φ = 14299416.

The previous prime is 22640899. The next prime is 22640921. The reversal of 22640913 is 31904622.

22640913 is a `hidden beast` number, since 2 + 2 + 640 + 9 + 13 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-22640913 is a prime.

It is a super-2 number, since 2×22640913² = 1025221882947138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22640963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66031 + ... + 66372.

Almost surely, 2^22640913 is an apocalyptic number.

It is an amenable number.

22640913 is a deficient number, since it is larger than the sum of its proper divisors (11784127).

22640913 is a wasteful number, since it uses less digits than its factorization.

22640913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132428 (or 132425 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 22640913 is about 4758.2468410119. The cubic root of 22640913 is about 282.8989346401.

The spelling of 22640913 in words is "twenty-two million, six hundred forty thousand, nine hundred thirteen".