22765721 has 8 divisors (see below), whose sum is σ = 24989664. Its totient is φ = 20567520.

The previous prime is 22765709. The next prime is 22765727. The reversal of 22765721 is 12756722.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22765721 - 2⁶ = 22765657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22765727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4556 + ... + 8141.

It is an arithmetic number, because the mean of its divisors is an integer number (3123708).

Almost surely, 2^22765721 is an apocalyptic number.

It is an amenable number.

22765721 is a deficient number, since it is larger than the sum of its proper divisors (2223943).

22765721 is a wasteful number, since it uses less digits than its factorization.

22765721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12871.

The product of its digits is 11760, while the sum is 32.

The square root of 22765721 is about 4771.3437310678. The cubic root of 22765721 is about 283.4178090287.

It can be divided in two parts, 2276 and 5721, that added together give a palindrome (7997).

The spelling of 22765721 in words is "twenty-two million, seven hundred sixty-five thousand, seven hundred twenty-one".