857420190172 has 72 divisors (see below), whose sum is σ = 1940365472640. Its totient is φ = 328257256320.

The previous prime is 857420190149. The next prime is 857420190181. The reversal of 857420190172 is 271091024758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5348547 + ... + 5506522.

Almost surely, 2^857420190172 is an apocalyptic number.

It is an amenable number.

857420190172 is an abundant number, since it is smaller than the sum of its proper divisors (1082945282468).

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

857420190172 is a wasteful number, since it uses less digits than its factorization.

857420190172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10855131 (or 10855122 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 857420190172 in words is "eight hundred fifty-seven billion, four hundred twenty million, one hundred ninety thousand, one hundred seventy-two".