22791664 has 40 divisors (see below), whose sum is σ = 51509600. Its totient is φ = 9765504.

The previous prime is 22791661. The next prime is 22791673. The reversal of 22791664 is 46619722.

22791664 = 67² + 68² + ... + 409².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22791661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3412 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (1287740).

Almost surely, 2^22791664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22791664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25754800).

22791664 is an abundant number, since it is smaller than the sum of its proper divisors (28717936).

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

22791664 is an equidigital number, since it uses as much as digits as its factorization.

22791664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4182 (or 4162 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 22791664 is about 4774.0615831805. The cubic root of 22791664 is about 283.5254257540.

The spelling of 22791664 in words is "twenty-two million, seven hundred ninety-one thousand, six hundred sixty-four".