22720878 has 16 divisors (see below), whose sum is σ = 50490960. Its totient is φ = 7573608.

The previous prime is 22720843. The next prime is 22720889. The reversal of 22720878 is 87802722.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 210325 + ... + 210432.

It is an arithmetic number, because the mean of its divisors is an integer number (3155685).

Almost surely, 2^22720878 is an apocalyptic number.

22720878 is an abundant number, since it is smaller than the sum of its proper divisors (27770082).

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

22720878 is a wasteful number, since it uses less digits than its factorization.

22720878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420768 (or 420762 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 22720878 is about 4766.6422143895. The cubic root of 22720878 is about 283.2315983846.

The spelling of 22720878 in words is "twenty-two million, seven hundred twenty thousand, eight hundred seventy-eight".