22739728 has 40 divisors (see below), whose sum is σ = 49104000. Its totient is φ = 10112640.

The previous prime is 22739711. The next prime is 22739729. The reversal of 22739728 is 82793722.

It is not an unprimeable number, because it can be changed into a prime (22739729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6898 + ... + 9646.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^22739728 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 22739728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24552000).

22739728 is an abundant number, since it is smaller than the sum of its proper divisors (26364272).

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

22739728 is a wasteful number, since it uses less digits than its factorization.

22739728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815 (or 2809 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 22739728 is about 4768.6190873250. The cubic root of 22739728 is about 283.3099028683.

The spelling of 22739728 in words is "twenty-two million, seven hundred thirty-nine thousand, seven hundred twenty-eight".