172618820 has 48 divisors (see below), whose sum is σ = 399204288. Its totient is φ = 62175360.

The previous prime is 172618807. The next prime is 172618843. The reversal of 172618820 is 28816271.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 19874 + ... + 27206.

It is an arithmetic number, because the mean of its divisors is an integer number (8316756).

Almost surely, 2^172618820 is an apocalyptic number.

172618820 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 172618820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199602144).

172618820 is an abundant number, since it is smaller than the sum of its proper divisors (226585468).

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

172618820 is a wasteful number, since it uses less digits than its factorization.

172618820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460 (or 7458 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 172618820 is about 13138.4481579827. The cubic root of 172618820 is about 556.7959245818.

The spelling of 172618820 in words is "one hundred seventy-two million, six hundred eighteen thousand, eight hundred twenty".