172391280 has 80 divisors (see below), whose sum is σ = 535706784. Its totient is φ = 45859840.

The previous prime is 172391269. The next prime is 172391281. The reversal of 172391280 is 82193271.

172391280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172391281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161950 + ... + 163010.

Almost surely, 2^172391280 is an apocalyptic number.

172391280 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 172391280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267853392).

172391280 is an abundant number, since it is smaller than the sum of its proper divisors (363315504).

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

172391280 is a wasteful number, since it uses less digits than its factorization.

172391280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 172391280 is about 13129.7859845467. The cubic root of 172391280 is about 556.5511674670.

The spelling of 172391280 in words is "one hundred seventy-two million, three hundred ninety-one thousand, two hundred eighty".