172216686 has 16 divisors (see below), whose sum is σ = 359409024. Its totient is φ = 54909624.

The previous prime is 172216679. The next prime is 172216727. The reversal of 172216686 is 686612271.

172216686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623836 + ... + 624111.

It is an arithmetic number, because the mean of its divisors is an integer number (22463064).

Almost surely, 2^172216686 is an apocalyptic number.

172216686 is an abundant number, since it is smaller than the sum of its proper divisors (187192338).

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

172216686 is a wasteful number, since it uses less digits than its factorization.

172216686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247975.

The product of its digits is 48384, while the sum is 39.

The square root of 172216686 is about 13123.1355247136. The cubic root of 172216686 is about 556.3632165122.

The spelling of 172216686 in words is "one hundred seventy-two million, two hundred sixteen thousand, six hundred eighty-six".