172975887 has 18 divisors (see below), whose sum is σ = 285719928. Its totient is φ = 98783712.

The previous prime is 172975841. The next prime is 172975919. The reversal of 172975887 is 788579271.

It is a happy number.

It is not a de Polignac number, because 172975887 - 2¹¹ = 172973839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172975987) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103563 + ... + 105219.

Almost surely, 2^172975887 is an apocalyptic number.

172975887 is a deficient number, since it is larger than the sum of its proper divisors (112744041).

172975887 is an frugal number, since it uses more digits than its factorization.

172975887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327 (or 1667 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 54.

The square root of 172975887 is about 13152.0297673021. The cubic root of 172975887 is about 557.1795763063.

The spelling of 172975887 in words is "one hundred seventy-two million, nine hundred seventy-five thousand, eight hundred eighty-seven".