857142864 has 120 divisors (see below), whose sum is σ = 2497965120. Its totient is φ = 281397888.

The previous prime is 857142841. The next prime is 857142887. The reversal of 857142864 is 468241758.

857142864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (857142841) and next prime (857142887).

It is a super-2 number, since 2×857142864² = 1469387778612244992, which contains 22 as substring.

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, 5132509 + ... + 5132675.

It is an arithmetic number, because the mean of its divisors is an integer number (20816376).

Almost surely, 2^857142864 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 857142864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1248982560).

857142864 is an abundant number, since it is smaller than the sum of its proper divisors (1640822256).

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

857142864 is a wasteful number, since it uses less digits than its factorization.

857142864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 281 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 857142864 is about 29277.0023055640. The cubic root of 857142864 is about 949.9142541261.

The spelling of 857142864 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred sixty-four".