22161672 has 48 divisors (see below), whose sum is σ = 64640940. Its totient is φ = 6818688.

The previous prime is 22161661. The next prime is 22161679. The reversal of 22161672 is 27616122.

It can be written as a sum of positive squares in 2 ways, for example, as 20848356 + 1313316 = 4566^2 + 1146^2 .

It is a super-2 number, since 2×22161672² = 982279411671168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161679) 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, 10903 + ... + 12774.

Almost surely, 2^22161672 is an apocalyptic number.

It is an amenable number.

22161672 is an abundant number, since it is smaller than the sum of its proper divisors (42479268).

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

22161672 is a wasteful number, since it uses less digits than its factorization.

22161672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23702 (or 23695 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 22161672 is about 4707.6185062088. The cubic root of 22161672 is about 280.8886393163. Note that the first 3 decimals are identical.

Adding to 22161672 its reverse (27616122), we get a palindrome (49777794).

The spelling of 22161672 in words is "twenty-two million, one hundred sixty-one thousand, six hundred seventy-two".