172556540 has 96 divisors (see below), whose sum is σ = 409436160. Its totient is φ = 60652800.

The previous prime is 172556539. The next prime is 172556561. The reversal of 172556540 is 45655271.

It is a self number, because there is not a number n which added to its sum of digits gives 172556540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636605 + ... + 636875.

It is an arithmetic number, because the mean of its divisors is an integer number (4264960).

Almost surely, 2^172556540 is an apocalyptic number.

172556540 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 172556540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204718080).

172556540 is an abundant number, since it is smaller than the sum of its proper divisors (236879620).

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

172556540 is a wasteful number, since it uses less digits than its factorization.

172556540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 172556540 is about 13136.0778012312. The cubic root of 172556540 is about 556.7289534727.

The spelling of 172556540 in words is "one hundred seventy-two million, five hundred fifty-six thousand, five hundred forty".