22728042 has 12 divisors (see below), whose sum is σ = 49244130. Its totient is φ = 7576008.

The previous prime is 22728007. The next prime is 22728059. The reversal of 22728042 is 24082722.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 741321 = 4689^2 + 861^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22727997 and 22728015.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 631317 + ... + 631352.

Almost surely, 2^22728042 is an apocalyptic number.

22728042 is an abundant number, since it is smaller than the sum of its proper divisors (26516088).

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

22728042 is a wasteful number, since it uses less digits than its factorization.

22728042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262677 (or 1262674 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 22728042 is about 4767.3936275495. The cubic root of 22728042 is about 283.2613633428.

The spelling of 22728042 in words is "twenty-two million, seven hundred twenty-eight thousand, forty-two".