22637609764 has 81 divisors (see below), whose sum is σ = 50705889969. Its totient is φ = 8810820480.

The previous prime is 22637609749. The next prime is 22637609773. The reversal of 22637609764 is 46790673622.

It is a happy number.

The square root of 22637609764 is 150458.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21178980900 + 1458628864 = 145530^2 + 38192^2 .

It is a super-2 number, since 2×22637609764² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23170044 + ... + 23171020.

Almost surely, 2^22637609764 is an apocalyptic number.

22637609764 is the 150458-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22637609764

22637609764 is an abundant number, since it is smaller than the sum of its proper divisors (28068280205).

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

22637609764 is an equidigital number, since it uses as much as digits as its factorization.

22637609764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 52.

The spelling of 22637609764 in words is "twenty-two billion, six hundred thirty-seven million, six hundred nine thousand, seven hundred sixty-four".