22721730 has 32 divisors (see below), whose sum is σ = 54777600. Its totient is φ = 6031872.

The previous prime is 22721717. The next prime is 22721731. The reversal of 22721730 is 3712722.

It is a self number, because there is not a number n which added to its sum of digits gives 22721730.

It is not an unprimeable number, because it can be changed into a prime (22721731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5586 + ... + 8754.

It is an arithmetic number, because the mean of its divisors is an integer number (1711800).

Almost surely, 2^22721730 is an apocalyptic number.

22721730 is an abundant number, since it is smaller than the sum of its proper divisors (32055870).

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

22721730 is a wasteful number, since it uses less digits than its factorization.

22721730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 22721730 is about 4766.7315846395. The cubic root of 22721730 is about 283.2351385985.

The spelling of 22721730 in words is "twenty-two million, seven hundred twenty-one thousand, seven hundred thirty".