22801788 has 18 divisors (see below), whose sum is σ = 57637944. Its totient is φ = 7600584.

The previous prime is 22801787. The next prime is 22801799. The reversal of 22801788 is 88710822.

It is a tau number, because it is divible by the number of its divisors (18).

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 Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 633383 = 22801788 / (2 + 2 + 8 + 0 + 1 + 7 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22801783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316656 + ... + 316727.

It is an arithmetic number, because the mean of its divisors is an integer number (3202108).

Almost surely, 2^22801788 is an apocalyptic number.

It is an amenable number.

22801788 is an abundant number, since it is smaller than the sum of its proper divisors (34836156).

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

22801788 is a wasteful number, since it uses less digits than its factorization.

22801788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633393 (or 633388 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 22801788 is about 4775.1217785518. The cubic root of 22801788 is about 283.5673999674.

The spelling of 22801788 in words is "twenty-two million, eight hundred one thousand, seven hundred eighty-eight".