2857857990 has 64 divisors (see below), whose sum is σ = 7415464896. Its totient is φ = 700710912.

The previous prime is 2857857979. The next prime is 2857858007. The reversal of 2857857990 is 997587582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85974 + ... + 114486.

It is an arithmetic number, because the mean of its divisors is an integer number (115866639).

Almost surely, 2^2857857990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2857857990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3707732448).

2857857990 is an abundant number, since it is smaller than the sum of its proper divisors (4557606906).

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

2857857990 is a wasteful number, since it uses less digits than its factorization.

2857857990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28793.

The product of its (nonzero) digits is 12700800, while the sum is 60.

The square root of 2857857990 is about 53458.9374192941. The cubic root of 2857857990 is about 1419.1017909548.

It can be divided in two parts, 28578 and 57990, that added together give a palindrome (86568).

The spelling of 2857857990 in words is "two billion, eight hundred fifty-seven million, eight hundred fifty-seven thousand, nine hundred ninety".