172730866 has 16 divisors (see below), whose sum is σ = 323029440. Its totient is φ = 67297680.

The previous prime is 172730861. The next prime is 172730867. The reversal of 172730866 is 668037271.

It is not an unprimeable number, because it can be changed into a prime (172730861) 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, 560661 + ... + 560968.

It is an arithmetic number, because the mean of its divisors is an integer number (20189340).

Almost surely, 2^172730866 is an apocalyptic number.

172730866 is a deficient number, since it is larger than the sum of its proper divisors (150298574).

172730866 is a wasteful number, since it uses less digits than its factorization.

172730866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121649.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 172730866 is about 13142.7115162740. The cubic root of 172730866 is about 556.9163696617.

The spelling of 172730866 in words is "one hundred seventy-two million, seven hundred thirty thousand, eight hundred sixty-six".