22428928 has 18 divisors (see below), whose sum is σ = 44770754. Its totient is φ = 11214336.

The previous prime is 22428883. The next prime is 22428937. The reversal of 22428928 is 82982422.

It can be written as a sum of positive squares in only one way, i.e., 21977344 + 451584 = 4688^2 + 672^2 .

It is a super-2 number, since 2×22428928² = 1006113622458368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43551 + ... + 44062.

Almost surely, 2^22428928 is an apocalyptic number.

It is an amenable number.

22428928 is a deficient number, since it is larger than the sum of its proper divisors (22341826).

22428928 is an frugal number, since it uses more digits than its factorization.

22428928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87629 (or 87615 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 22428928 is about 4735.9189182248. The cubic root of 22428928 is about 282.0132448552.

The spelling of 22428928 in words is "twenty-two million, four hundred twenty-eight thousand, nine hundred twenty-eight".