22728737 has 4 divisors (see below), whose sum is σ = 22953876. Its totient is φ = 22503600.

The previous prime is 22728703. The next prime is 22728757. The reversal of 22728737 is 73782722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22287841 + 440896 = 4721^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 22728737 - 2¹⁰ = 22727713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22728737.

It is not an unprimeable number, because it can be changed into a prime (22728757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112418 + ... + 112619.

It is an arithmetic number, because the mean of its divisors is an integer number (5738469).

Almost surely, 2^22728737 is an apocalyptic number.

It is an amenable number.

22728737 is a deficient number, since it is larger than the sum of its proper divisors (225139).

22728737 is a wasteful number, since it uses less digits than its factorization.

22728737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225138.

The product of its digits is 65856, while the sum is 38.

The square root of 22728737 is about 4767.4665179737. The cubic root of 22728737 is about 283.2642505931.

The spelling of 22728737 in words is "twenty-two million, seven hundred twenty-eight thousand, seven hundred thirty-seven".