22000428 has 36 divisors (see below), whose sum is σ = 55866720. Its totient is φ = 7299936.

The previous prime is 22000427. The next prime is 22000441. The reversal of 22000428 is 82400022.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 22000428.

It is not an unprimeable number, because it can be changed into a prime (22000427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7326 + ... + 9882.

Almost surely, 2^22000428 is an apocalyptic number.

It is an amenable number.

22000428 is an abundant number, since it is smaller than the sum of its proper divisors (33866292).

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

22000428 is a wasteful number, since it uses less digits than its factorization.

22000428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 22000428 is about 4690.4613845548. The cubic root of 22000428 is about 280.2057501338.

The spelling of 22000428 in words is "twenty-two million, four hundred twenty-eight", and thus it is an aban number.