22788720 has 120 divisors (see below), whose sum is σ = 79078272. Its totient is φ = 5875200.

The previous prime is 22788713. The next prime is 22788737. The reversal of 22788720 is 2788722.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21810 + ... + 22830.

Almost surely, 2^22788720 is an apocalyptic number.

22788720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22788720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39539136).

22788720 is an abundant number, since it is smaller than the sum of its proper divisors (56289552).

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

22788720 is a wasteful number, since it uses less digits than its factorization.

22788720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 1062 counting only the distinct ones).

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

The square root of 22788720 is about 4773.7532403760. The cubic root of 22788720 is about 283.5132175654.

The spelling of 22788720 in words is "twenty-two million, seven hundred eighty-eight thousand, seven hundred twenty".