22786638 has 16 divisors (see below), whose sum is σ = 52083840. Its totient is φ = 6510456.

The previous prime is 22786627. The next prime is 22786639. The reversal of 22786638 is 83668722.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 542539 = 22786638 / (2 + 2 + 7 + 8 + 6 + 6 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 22786638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22786639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271228 + ... + 271311.

It is an arithmetic number, because the mean of its divisors is an integer number (3255240).

Almost surely, 2^22786638 is an apocalyptic number.

22786638 is an abundant number, since it is smaller than the sum of its proper divisors (29297202).

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

22786638 is a wasteful number, since it uses less digits than its factorization.

22786638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542551.

The product of its digits is 193536, while the sum is 42.

The square root of 22786638 is about 4773.5351679861. The cubic root of 22786638 is about 283.5045832865.

The spelling of 22786638 in words is "twenty-two million, seven hundred eighty-six thousand, six hundred thirty-eight".