857855872 has 32 divisors (see below), whose sum is σ = 1718006400. Its totient is φ = 426670080.

The previous prime is 857855849. The next prime is 857855897. The reversal of 857855872 is 278558758.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6904 + ... + 41992.

It is an arithmetic number, because the mean of its divisors is an integer number (53687700).

Almost surely, 2^857855872 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 857855872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859003200).

857855872 is an abundant number, since it is smaller than the sum of its proper divisors (860150528).

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

857855872 is a wasteful number, since it uses less digits than its factorization.

857855872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35294 (or 35282 counting only the distinct ones).

The product of its digits is 6272000, while the sum is 55.

The square root of 857855872 is about 29289.1767040318. The cubic root of 857855872 is about 950.1775741926.

The spelling of 857855872 in words is "eight hundred fifty-seven million, eight hundred fifty-five thousand, eight hundred seventy-two".