172216646 has 32 divisors (see below), whose sum is σ = 318366720. Its totient is φ = 68212800.

The previous prime is 172216643. The next prime is 172216673. The reversal of 172216646 is 646612271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172216643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3011 + ... + 18801.

It is an arithmetic number, because the mean of its divisors is an integer number (9948960).

Almost surely, 2^172216646 is an apocalyptic number.

172216646 is a deficient number, since it is larger than the sum of its proper divisors (146150074).

172216646 is a wasteful number, since it uses less digits than its factorization.

172216646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15860.

The product of its digits is 24192, while the sum is 35.

The square root of 172216646 is about 13123.1340006875. The cubic root of 172216646 is about 556.3631734375.

The spelling of 172216646 in words is "one hundred seventy-two million, two hundred sixteen thousand, six hundred forty-six".