857898990 has 96 divisors (see below), whose sum is σ = 2453383296. Its totient is φ = 206668800.

The previous prime is 857898989. The next prime is 857899013. The reversal of 857898990 is 99898758.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47190 + ... + 62790.

It is an arithmetic number, because the mean of its divisors is an integer number (25556076).

Almost surely, 2^857898990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857898990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226691648).

857898990 is an abundant number, since it is smaller than the sum of its proper divisors (1595484306).

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

857898990 is a wasteful number, since it uses less digits than its factorization.

857898990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15674 (or 15671 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 63.

The square root of 857898990 is about 29289.9127687332. The cubic root of 857898990 is about 950.1934933664.

The spelling of 857898990 in words is "eight hundred fifty-seven million, eight hundred ninety-eight thousand, nine hundred ninety".