172520280856 has 32 divisors (see below), whose sum is σ = 403294164480. Its totient is φ = 67215693600.

The previous prime is 172520280791. The next prime is 172520280859. The reversal of 172520280856 is 658082025271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172520280859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140032080 + ... + 140033311.

It is an arithmetic number, because the mean of its divisors is an integer number (12602942640).

Almost surely, 2^172520280856 is an apocalyptic number.

It is an amenable number.

172520280856 is an abundant number, since it is smaller than the sum of its proper divisors (230773883624).

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

172520280856 is a wasteful number, since it uses less digits than its factorization.

172520280856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280065415 (or 280065411 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 172520280856 in words is "one hundred seventy-two billion, five hundred twenty million, two hundred eighty thousand, eight hundred fifty-six".