22910728 has 8 divisors (see below), whose sum is σ = 42957630. Its totient is φ = 11455360.

The previous prime is 22910707. The next prime is 22910729. The reversal of 22910728 is 82701922.

It can be written as a sum of positive squares in only one way, i.e., 15824484 + 7086244 = 3978^2 + 2662^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 22910728.

It is not an unprimeable number, because it can be changed into a prime (22910729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1431913 + ... + 1431928.

Almost surely, 2^22910728 is an apocalyptic number.

22910728 is the 2559-th centered heptagonal number.

It is an amenable number.

22910728 is a deficient number, since it is larger than the sum of its proper divisors (20046902).

22910728 is a wasteful number, since it uses less digits than its factorization.

22910728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863847 (or 2863843 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 22910728 is about 4786.5152250881. The cubic root of 22910728 is about 284.0182822324.

The spelling of 22910728 in words is "twenty-two million, nine hundred ten thousand, seven hundred twenty-eight".