22597728 has 48 divisors (see below), whose sum is σ = 61372080. Its totient is φ = 7271936.

The previous prime is 22597717. The next prime is 22597733. The reversal of 22597728 is 82779522.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 22597728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275 + ... + 6842.

It is an arithmetic number, because the mean of its divisors is an integer number (1278585).

Almost surely, 2^22597728 is an apocalyptic number.

It is an amenable number.

22597728 is an abundant number, since it is smaller than the sum of its proper divisors (38774352).

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

22597728 is a wasteful number, since it uses less digits than its factorization.

22597728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8159 (or 8151 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 22597728 is about 4753.7067641999. The cubic root of 22597728 is about 282.7189541737.

The spelling of 22597728 in words is "twenty-two million, five hundred ninety-seven thousand, seven hundred twenty-eight".