172220664 has 128 divisors (see below), whose sum is σ = 550126080. Its totient is φ = 43622400.

The previous prime is 172220639. The next prime is 172220669. The reversal of 172220664 is 466022271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172220669) 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 31 ways as a sum of consecutive naturals, for example, 74632 + ... + 76904.

It is an arithmetic number, because the mean of its divisors is an integer number (4297860).

Almost surely, 2^172220664 is an apocalyptic number.

172220664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172220664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275063040).

172220664 is an abundant number, since it is smaller than the sum of its proper divisors (377905416).

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

172220664 is a wasteful number, since it uses less digits than its factorization.

172220664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341 (or 2337 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 172220664 is about 13123.2870882260. The cubic root of 172220664 is about 556.3675002547.

The spelling of 172220664 in words is "one hundred seventy-two million, two hundred twenty thousand, six hundred sixty-four".