22387968 has 144 divisors (see below), whose sum is σ = 68678400. Its totient is φ = 7188480.

The previous prime is 22387961. The next prime is 22387979. The reversal of 22387968 is 86978322.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×22387968² = 1002442222338048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22387961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283353 + ... + 283431.

Almost surely, 2^22387968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22387968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34339200).

22387968 is an abundant number, since it is smaller than the sum of its proper divisors (46290432).

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

22387968 is an equidigital number, since it uses as much as digits as its factorization.

22387968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 125 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 22387968 is about 4731.5925437425. The cubic root of 22387968 is about 281.8414681606.

The spelling of 22387968 in words is "twenty-two million, three hundred eighty-seven thousand, nine hundred sixty-eight".