172389280 has 96 divisors (see below), whose sum is σ = 490008960. Its totient is φ = 55987200.

The previous prime is 172389271. The next prime is 172389293. The reversal of 172389280 is 82983271.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17230 + ... + 25330.

It is an arithmetic number, because the mean of its divisors is an integer number (5104260).

Almost surely, 2^172389280 is an apocalyptic number.

172389280 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 172389280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245004480).

172389280 is an abundant number, since it is smaller than the sum of its proper divisors (317619680).

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

172389280 is a wasteful number, since it uses less digits than its factorization.

172389280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142 (or 8134 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 172389280 is about 13129.7098216221. The cubic root of 172389280 is about 556.5490151798.

The spelling of 172389280 in words is "one hundred seventy-two million, three hundred eighty-nine thousand, two hundred eighty".