172871672 has 8 divisors (see below), whose sum is σ = 324134400. Its totient is φ = 86435832.

The previous prime is 172871663. The next prime is 172871683. The reversal of 172871672 is 276178271.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×172871672² = 59769229960151168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10804472 + ... + 10804487.

It is an arithmetic number, because the mean of its divisors is an integer number (40516800).

Almost surely, 2^172871672 is an apocalyptic number.

It is an amenable number.

172871672 is a deficient number, since it is larger than the sum of its proper divisors (151262728).

172871672 is a wasteful number, since it uses less digits than its factorization.

172871672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21608965 (or 21608961 counting only the distinct ones).

The product of its digits is 65856, while the sum is 41.

The square root of 172871672 is about 13148.0672343885. The cubic root of 172871672 is about 557.0676567862.

The spelling of 172871672 in words is "one hundred seventy-two million, eight hundred seventy-one thousand, six hundred seventy-two".