172643956 has 24 divisors (see below), whose sum is σ = 318476480. Its totient is φ = 81663552.

The previous prime is 172643941. The next prime is 172643963. The reversal of 172643956 is 659346271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79720 + ... + 81856.

Almost surely, 2^172643956 is an apocalyptic number.

It is an amenable number.

172643956 is a deficient number, since it is larger than the sum of its proper divisors (145832524).

172643956 is a wasteful number, since it uses less digits than its factorization.

172643956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223 (or 3221 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The square root of 172643956 is about 13139.4047049324. The cubic root of 172643956 is about 556.8229493351.

The spelling of 172643956 in words is "one hundred seventy-two million, six hundred forty-three thousand, nine hundred fifty-six".