172161770 has 32 divisors (see below), whose sum is σ = 339970176. Its totient is φ = 62251200.

The previous prime is 172161767. The next prime is 172161797. The reversal of 172161770 is 77161271.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15587 + ... + 24233.

It is an arithmetic number, because the mean of its divisors is an integer number (10624068).

Almost surely, 2^172161770 is an apocalyptic number.

172161770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172161770 is a deficient number, since it is larger than the sum of its proper divisors (167808406).

172161770 is a wasteful number, since it uses less digits than its factorization.

172161770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8846.

The product of its (nonzero) digits is 4116, while the sum is 32.

The square root of 172161770 is about 13121.0430225649. The cubic root of 172161770 is about 556.3040730163.

The spelling of 172161770 in words is "one hundred seventy-two million, one hundred sixty-one thousand, seven hundred seventy".