857115840 has 448 divisors, whose sum is σ = 3364992000. Its totient is φ = 184246272.

The previous prime is 857115827. The next prime is 857115863. The reversal of 857115840 is 48511758.

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6256252 + ... + 6256388.

Almost surely, 2^857115840 is an apocalyptic number.

857115840 is a gapful number since it is divisible by the number (80) 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 857115840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682496000).

857115840 is an abundant number, since it is smaller than the sum of its proper divisors (2507876160).

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

857115840 is a wasteful number, since it uses less digits than its factorization.

857115840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 39.

The square root of 857115840 is about 29276.5407792656. The cubic root of 857115840 is about 949.9042710557.

The spelling of 857115840 in words is "eight hundred fifty-seven million, one hundred fifteen thousand, eight hundred forty".