172100840 has 64 divisors (see below), whose sum is σ = 408360960. Its totient is φ = 65180160.

The previous prime is 172100839. The next prime is 172100861. The reversal of 172100840 is 48001271.

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, 56804 + ... + 59756.

It is an arithmetic number, because the mean of its divisors is an integer number (6380640).

Almost surely, 2^172100840 is an apocalyptic number.

172100840 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 172100840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204180480).

172100840 is an abundant number, since it is smaller than the sum of its proper divisors (236260120).

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

172100840 is a wasteful number, since it uses less digits than its factorization.

172100840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042 (or 3038 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 172100840 is about 13118.7209742414. The cubic root of 172100840 is about 556.2384378357.

The spelling of 172100840 in words is "one hundred seventy-two million, one hundred thousand, eight hundred forty".