22728979 has 12 divisors (see below), whose sum is σ = 28129296. Its totient is φ = 17982432.

The previous prime is 22728977. The next prime is 22729019. The reversal of 22728979 is 97982722.

22728979 = T₄₀₆ + T₄₀₇ + ... + T₅₈₇.

It is not a de Polignac number, because 22728979 - 2¹ = 22728977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22728977) 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, 8424 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (2344108).

Almost surely, 2^22728979 is an apocalyptic number.

22728979 is a deficient number, since it is larger than the sum of its proper divisors (5400317).

22728979 is a wasteful number, since it uses less digits than its factorization.

22728979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19246 (or 19233 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 22728979 is about 4767.4918982626. The cubic root of 22728979 is about 283.2652559240.

The spelling of 22728979 in words is "twenty-two million, seven hundred twenty-eight thousand, nine hundred seventy-nine".