222161724 has 24 divisors (see below), whose sum is σ = 575975120. Its totient is φ = 74053872.

The previous prime is 222161677. The next prime is 222161759. The reversal of 222161724 is 427161222.

222161724 is a `hidden beast` number, since 2 + 2 + 21 + 617 + 24 = 666.

It is a super-2 number, since 2×222161724² = 98711663221304352, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028419 + ... + 1028634.

Almost surely, 2^222161724 is an apocalyptic number.

It is an amenable number.

222161724 is an abundant number, since it is smaller than the sum of its proper divisors (353813396).

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

222161724 is a wasteful number, since it uses less digits than its factorization.

222161724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057066 (or 2057058 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 222161724 is about 14905.0905398122. The cubic root of 222161724 is about 605.6518930059.

The spelling of 222161724 in words is "two hundred twenty-two million, one hundred sixty-one thousand, seven hundred twenty-four".