172216730 has 32 divisors (see below), whose sum is σ = 357540480. Its totient is φ = 58501440.

The previous prime is 172216727. The next prime is 172216739. The reversal of 172216730 is 37612271.

It is a junction number, because it is equal to n+sod(n) for n = 172216693 and 172216702.

It is not an unprimeable number, because it can be changed into a prime (172216739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3656 + ... + 18915.

It is an arithmetic number, because the mean of its divisors is an integer number (11173140).

Almost surely, 2^172216730 is an apocalyptic number.

172216730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172216730 is an abundant number, since it is smaller than the sum of its proper divisors (185323750).

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

172216730 is a wasteful number, since it uses less digits than its factorization.

172216730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22694.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 172216730 is about 13123.1372011421. The cubic root of 172216730 is about 556.3632638943.

The spelling of 172216730 in words is "one hundred seventy-two million, two hundred sixteen thousand, seven hundred thirty".