22638487638 has 16 divisors (see below), whose sum is σ = 48759819696. Its totient is φ = 6965688480.

The previous prime is 22638487591. The next prime is 22638487639. The reversal of 22638487638 is 83678483622.

It is a super-2 number, since 2×22638487638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22638487639) 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, 145118433 + ... + 145118588.

It is an arithmetic number, because the mean of its divisors is an integer number (3047488731).

Almost surely, 2^22638487638 is an apocalyptic number.

22638487638 is an abundant number, since it is smaller than the sum of its proper divisors (26121332058).

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

22638487638 is a wasteful number, since it uses less digits than its factorization.

22638487638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290237039.

The product of its digits is 18579456, while the sum is 57.

The spelling of 22638487638 in words is "twenty-two billion, six hundred thirty-eight million, four hundred eighty-seven thousand, six hundred thirty-eight".