22991872 has 22 divisors (see below), whose sum is σ = 45963338. Its totient is φ = 11495424.

The previous prime is 22991869. The next prime is 22991909. The reversal of 22991872 is 27819922.

It can be written as a sum of positive squares in only one way, i.e., 15241216 + 7750656 = 3904^2 + 2784^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203 + ... + 12250.

Almost surely, 2^22991872 is an apocalyptic number.

It is an amenable number.

22991872 is a deficient number, since it is larger than the sum of its proper divisors (22971466).

22991872 is an equidigital number, since it uses as much as digits as its factorization.

22991872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22473 (or 22455 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 22991872 is about 4794.9840458546. The cubic root of 22991872 is about 284.3531941095.

The spelling of 22991872 in words is "twenty-two million, nine hundred ninety-one thousand, eight hundred seventy-two".