22709640 has 64 divisors (see below), whose sum is σ = 68866560. Its totient is φ = 5990400.

The previous prime is 22709627. The next prime is 22709641. The reversal of 22709640 is 4690722.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22709598 and 22709607.

It is not an unprimeable number, because it can be changed into a prime (22709641) 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, 10665 + ... + 12615.

It is an arithmetic number, because the mean of its divisors is an integer number (1076040).

Almost surely, 2^22709640 is an apocalyptic number.

22709640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22709640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34433280).

22709640 is an abundant number, since it is smaller than the sum of its proper divisors (46156920).

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

22709640 is a wasteful number, since it uses less digits than its factorization.

22709640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062 (or 2058 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 22709640 is about 4765.4632513534. The cubic root of 22709640 is about 283.1848941798.

The spelling of 22709640 in words is "twenty-two million, seven hundred nine thousand, six hundred forty".