857449918272 has 112 divisors (see below), whose sum is σ = 2285828377280. Its totient is φ = 283656425472.

The previous prime is 857449918271. The next prime is 857449918291. The reversal of 857449918272 is 272819944758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857449918271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114674598 + ... + 114682074.

It is an arithmetic number, because the mean of its divisors is an integer number (20409181940).

Almost surely, 2^857449918272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857449918272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142914188640).

857449918272 is an abundant number, since it is smaller than the sum of its proper divisors (1428378459008).

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

857449918272 is a wasteful number, since it uses less digits than its factorization.

857449918272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11928 (or 11918 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 66.

The spelling of 857449918272 in words is "eight hundred fifty-seven billion, four hundred forty-nine million, nine hundred eighteen thousand, two hundred seventy-two".