22487665 has 4 divisors (see below), whose sum is σ = 26985204. Its totient is φ = 17990128.

The previous prime is 22487627. The next prime is 22487671. The reversal of 22487665 is 56678422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56678422 = 2 ⋅28339211.

It can be written as a sum of positive squares in 2 ways, for example, as 5914624 + 16573041 = 2432^2 + 4071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22487665 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2248762 + ... + 2248771.

It is an arithmetic number, because the mean of its divisors is an integer number (6746301).

Almost surely, 2^22487665 is an apocalyptic number.

It is an amenable number.

22487665 is a deficient number, since it is larger than the sum of its proper divisors (4497539).

22487665 is an equidigital number, since it uses as much as digits as its factorization.

22487665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4497538.

The product of its digits is 161280, while the sum is 40.

The square root of 22487665 is about 4742.1160888363. The cubic root of 22487665 is about 282.2592095476.

The spelling of 22487665 in words is "twenty-two million, four hundred eighty-seven thousand, six hundred sixty-five".