172009772 has 24 divisors (see below), whose sum is σ = 330598800. Its totient is φ = 77658560.

The previous prime is 172009771. The next prime is 172009807. The reversal of 172009772 is 277900271.

It is not an unprimeable number, because it can be changed into a prime (172009771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6563 + ... + 19674.

It is an arithmetic number, because the mean of its divisors is an integer number (13774950).

Almost surely, 2^172009772 is an apocalyptic number.

It is an amenable number.

172009772 is a deficient number, since it is larger than the sum of its proper divisors (158589028).

172009772 is a wasteful number, since it uses less digits than its factorization.

172009772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26401 (or 26399 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 172009772 is about 13115.2495973199. The cubic root of 172009772 is about 556.1403084298.

The spelling of 172009772 in words is "one hundred seventy-two million, nine thousand, seven hundred seventy-two".