22640465 has 4 divisors (see below), whose sum is σ = 27168564. Its totient is φ = 18112368.

The previous prime is 22640461. The next prime is 22640467. The reversal of 22640465 is 56404622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5764801 + 16875664 = 2401^2 + 4108^2 .

It is a cyclic number.

It is not a de Polignac number, because 22640465 - 2² = 22640461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22640461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2264042 + ... + 2264051.

It is an arithmetic number, because the mean of its divisors is an integer number (6792141).

Almost surely, 2^22640465 is an apocalyptic number.

It is an amenable number.

22640465 is a deficient number, since it is larger than the sum of its proper divisors (4528099).

22640465 is an equidigital number, since it uses as much as digits as its factorization.

22640465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528098.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 22640465 is about 4758.1997646169. The cubic root of 22640465 is about 282.8970687030.

The spelling of 22640465 in words is "twenty-two million, six hundred forty thousand, four hundred sixty-five".