22721598 has 12 divisors (see below), whose sum is σ = 49230168. Its totient is φ = 7573860.

The previous prime is 22721597. The next prime is 22721603. The reversal of 22721598 is 89512722.

It is a Curzon number.

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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 631138 + ... + 631173.

It is an arithmetic number, because the mean of its divisors is an integer number (4102514).

Almost surely, 2^22721598 is an apocalyptic number.

22721598 is an abundant number, since it is smaller than the sum of its proper divisors (26508570).

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

22721598 is a wasteful number, since it uses less digits than its factorization.

22721598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262319 (or 1262316 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 22721598 is about 4766.7177386541. The cubic root of 22721598 is about 283.2345901205.

The spelling of 22721598 in words is "twenty-two million, seven hundred twenty-one thousand, five hundred ninety-eight".