172216746 has 96 divisors (see below), whose sum is σ = 420577920. Its totient is φ = 52206336.

The previous prime is 172216739. The next prime is 172216747. The reversal of 172216746 is 647612271.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 172216746.

It is not an unprimeable number, because it can be changed into a prime (172216747) 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 47 ways as a sum of consecutive naturals, for example, 1031155 + ... + 1031321.

It is an arithmetic number, because the mean of its divisors is an integer number (4381020).

Almost surely, 2^172216746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172216746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210288960).

172216746 is an abundant number, since it is smaller than the sum of its proper divisors (248361174).

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

172216746 is a wasteful number, since it uses less digits than its factorization.

172216746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 298 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 172216746 is about 13123.1378107524. The cubic root of 172216746 is about 556.3632811242.

The spelling of 172216746 in words is "one hundred seventy-two million, two hundred sixteen thousand, seven hundred forty-six".