22161690 has 24 divisors (see below), whose sum is σ = 57620628. Its totient is φ = 5909760.

The previous prime is 22161679. The next prime is 22161697. The reversal of 22161690 is 9616122.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 1830609 = 4509^2 + 1353^2 .

It is a super-2 number, since 2×22161690² = 982281007312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123031 + ... + 123210.

Almost surely, 2^22161690 is an apocalyptic number.

22161690 is an abundant number, since it is smaller than the sum of its proper divisors (35458938).

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

22161690 is a wasteful number, since it uses less digits than its factorization.

22161690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246254 (or 246251 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 22161690 is about 4707.6204180031. The cubic root of 22161690 is about 280.8887153634. Note that the first 3 decimals are identical.

The spelling of 22161690 in words is "twenty-two million, one hundred sixty-one thousand, six hundred ninety".