22728738 has 16 divisors (see below), whose sum is σ = 47434176. Its totient is φ = 7246800.

The previous prime is 22728703. The next prime is 22728757. The reversal of 22728738 is 83782722.

It is a junction number, because it is equal to n+sod(n) for n = 22728696 and 22728705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82213 + ... + 82488.

It is an arithmetic number, because the mean of its divisors is an integer number (2964636).

Almost surely, 2^22728738 is an apocalyptic number.

22728738 is an abundant number, since it is smaller than the sum of its proper divisors (24705438).

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

22728738 is a wasteful number, since it uses less digits than its factorization.

22728738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164729.

The product of its digits is 75264, while the sum is 39.

The square root of 22728738 is about 4767.4666228512. The cubic root of 22728738 is about 283.2642547474.

The spelling of 22728738 in words is "twenty-two million, seven hundred twenty-eight thousand, seven hundred thirty-eight".