172273320 has 96 divisors (see below), whose sum is σ = 570515400. Its totient is φ = 45067776.

The previous prime is 172273303. The next prime is 172273327. The reversal of 172273320 is 23372271.

It is a happy number.

172273320 is a `hidden beast` number, since 1 + 72 + 273 + 320 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 172186884 + 86436 = 13122^2 + 294^2 .

It is not an unprimeable number, because it can be changed into a prime (172273327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14566 + ... + 23594.

Almost surely, 2^172273320 is an apocalyptic number.

172273320 is a gapful number since it is divisible by the number (10) 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 172273320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285257700).

172273320 is an abundant number, since it is smaller than the sum of its proper divisors (398242080).

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

172273320 is a wasteful number, since it uses less digits than its factorization.

172273320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9099 (or 9092 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 172273320 is about 13125.2931395836. The cubic root of 172273320 is about 556.4241970939.

The spelling of 172273320 in words is "one hundred seventy-two million, two hundred seventy-three thousand, three hundred twenty".