22640639 has 4 divisors (see below), whose sum is σ = 25875024. Its totient is φ = 19406256.

The previous prime is 22640603. The next prime is 22640641. The reversal of 22640639 is 93604622.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22640639 - 2¹⁶ = 22575103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22640339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617182 + ... + 1617195.

It is an arithmetic number, because the mean of its divisors is an integer number (6468756).

Almost surely, 2^22640639 is an apocalyptic number.

22640639 is a deficient number, since it is larger than the sum of its proper divisors (3234385).

22640639 is an equidigital number, since it uses as much as digits as its factorization.

22640639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234384.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 22640639 is about 4758.2180488078. The cubic root of 22640639 is about 282.8977934226.

The spelling of 22640639 in words is "twenty-two million, six hundred forty thousand, six hundred thirty-nine".