172945980 has 144 divisors (see below), whose sum is σ = 561943200. Its totient is φ = 42923520.

The previous prime is 172945963. The next prime is 172945991. The reversal of 172945980 is 89549271.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208206 + ... + 209034.

Almost surely, 2^172945980 is an apocalyptic number.

172945980 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 172945980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280971600).

172945980 is an abundant number, since it is smaller than the sum of its proper divisors (388997220).

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

172945980 is a wasteful number, since it uses less digits than its factorization.

172945980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 919 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 172945980 is about 13150.8927453614. The cubic root of 172945980 is about 557.1474629092.

The spelling of 172945980 in words is "one hundred seventy-two million, nine hundred forty-five thousand, nine hundred eighty".