172117816 has 16 divisors (see below), whose sum is σ = 347545800. Its totient is φ = 79438944.

The previous prime is 172117811. The next prime is 172117819. The reversal of 172117816 is 618711271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172117811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827386 + ... + 827593.

Almost surely, 2^172117816 is an apocalyptic number.

It is an amenable number.

172117816 is an abundant number, since it is smaller than the sum of its proper divisors (175427984).

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

172117816 is a wasteful number, since it uses less digits than its factorization.

172117816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654998 (or 1654994 counting only the distinct ones).

The product of its digits is 4704, while the sum is 34.

The square root of 172117816 is about 13119.3679725816. The cubic root of 172117816 is about 556.2567263253.

The spelling of 172117816 in words is "one hundred seventy-two million, one hundred seventeen thousand, eight hundred sixteen".