172228608 has 114 divisors (see below), whose sum is σ = 504364094. Its totient is φ = 56623104.

The previous prime is 172228601. The next prime is 172228619. The reversal of 172228608 is 806822271.

It is a happy number.

172228608 is a `hidden beast` number, since 1 + 7 + 22 + 28 + 608 = 666.

It can be written as a sum of positive squares in only one way, i.e., 150994944 + 21233664 = 12288^2 + 4608^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (172228601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2359260 + ... + 2359332.

Almost surely, 2^172228608 is an apocalyptic number.

172228608 is a gapful number since it is divisible by the number (18) 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 172228608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252182047).

172228608 is an abundant number, since it is smaller than the sum of its proper divisors (332135486).

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

172228608 is an frugal number, since it uses more digits than its factorization.

172228608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 172228608 is about 13123.5897528077. The cubic root of 172228608 is about 556.3760546201.

The spelling of 172228608 in words is "one hundred seventy-two million, two hundred twenty-eight thousand, six hundred eight".