2857890 has 64 divisors (see below), whose sum is σ = 8110080. Its totient is φ = 630720.

The previous prime is 2857889. The next prime is 2857891. The reversal of 2857890 is 987582.

It is an interprime number because it is at equal distance from previous prime (2857889) and next prime (2857891).

It is not an unprimeable number, because it can be changed into a prime (2857891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6291 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (126720).

2^2857890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2857890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4055040).

2857890 is an abundant number, since it is smaller than the sum of its proper divisors (5252190).

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

2857890 is a wasteful number, since it uses less digits than its factorization.

2857890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 2857890 is about 1690.5295028481. The cubic root of 2857890 is about 141.9107089245.

The spelling of 2857890 in words is "two million, eight hundred fifty-seven thousand, eight hundred ninety".