22721590 has 16 divisors (see below), whose sum is σ = 40957488. Its totient is φ = 9075616.

The previous prime is 22721581. The next prime is 22721591. The reversal of 22721590 is 9512722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22721591) 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, 9009 + ... + 11251.

It is an arithmetic number, because the mean of its divisors is an integer number (2559843).

Almost surely, 2^22721590 is an apocalyptic number.

22721590 is a deficient number, since it is larger than the sum of its proper divisors (18235898).

22721590 is a wasteful number, since it uses less digits than its factorization.

22721590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22721590 is about 4766.7168995022. The cubic root of 22721590 is about 283.2345568793.

The spelling of 22721590 in words is "twenty-two million, seven hundred twenty-one thousand, five hundred ninety".