22728720 has 160 divisors (see below), whose sum is σ = 81994752. Its totient is φ = 5101056.

The previous prime is 22728703. The next prime is 22728757. The reversal of 22728720 is 2782722.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139359 + ... + 139521.

Almost surely, 2^22728720 is an apocalyptic number.

22728720 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 22728720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40997376).

22728720 is an abundant number, since it is smaller than the sum of its proper divisors (59266032).

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

22728720 is a wasteful number, since it uses less digits than its factorization.

22728720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 22728720 is about 4767.4647350557. The cubic root of 22728720 is about 283.2641799704.

The spelling of 22728720 in words is "twenty-two million, seven hundred twenty-eight thousand, seven hundred twenty".