857142090 has 96 divisors (see below), whose sum is σ = 2575722240. Its totient is φ = 193704192.

The previous prime is 857142073. The next prime is 857142109. The reversal of 857142090 is 90241758.

857142090 is a `hidden beast` number, since 85 + 71 + 420 + 90 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48427 + ... + 63713.

It is an arithmetic number, because the mean of its divisors is an integer number (26830440).

Almost surely, 2^857142090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857142090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287861120).

857142090 is an abundant number, since it is smaller than the sum of its proper divisors (1718580150).

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

857142090 is a wasteful number, since it uses less digits than its factorization.

857142090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15396 (or 15393 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 857142090 is about 29276.9890869946. The cubic root of 857142090 is about 949.9139682018.

The spelling of 857142090 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, ninety".