22728640 has 84 divisors (see below), whose sum is σ = 59591448. Its totient is φ = 8250880.

The previous prime is 22728613. The next prime is 22728653. The reversal of 22728640 is 4682722.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38427 + ... + 39013.

It is an arithmetic number, because the mean of its divisors is an integer number (709422).

Almost surely, 2^22728640 is an apocalyptic number.

22728640 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 22728640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29795724).

22728640 is an abundant number, since it is smaller than the sum of its proper divisors (36862808).

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

22728640 is a wasteful number, since it uses less digits than its factorization.

22728640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 22728640 is about 4767.4563448447. The cubic root of 22728640 is about 283.2638476279.

The spelling of 22728640 in words is "twenty-two million, seven hundred twenty-eight thousand, six hundred forty".