22443600978 has 18 divisors (see below), whose sum is σ = 48629179287. Its totient is φ = 7480988460.

The previous prime is 22443600967. The next prime is 22443601027. The reversal of 22443600978 is 87900634422.

It can be written as a sum of positive squares in only one way, i.e., 11221800489 + 11221800489 = 105933^2 + 105933^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=105933.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 617943 + ... + 653253.

Almost surely, 2^22443600978 is an apocalyptic number.

22443600978 is an abundant number, since it is smaller than the sum of its proper divisors (26185578309).

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

22443600978 is an frugal number, since it uses more digits than its factorization.

22443600978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70630 (or 35316 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 22443600978 in words is "twenty-two billion, four hundred forty-three million, six hundred thousand, nine hundred seventy-eight".