2857638 has 32 divisors (see below), whose sum is σ = 6877440. Its totient is φ = 773280.

The previous prime is 2857637. The next prime is 2857639. The reversal of 2857638 is 8367582.

It is an interprime number because it is at equal distance from previous prime (2857637) and next prime (2857639).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2857596 and 2857605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 993 + ... + 2588.

It is an arithmetic number, because the mean of its divisors is an integer number (214920).

2^2857638 is an apocalyptic number.

2857638 is an abundant number, since it is smaller than the sum of its proper divisors (4019802).

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

2857638 is a wasteful number, since it uses less digits than its factorization.

2857638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612.

The product of its digits is 80640, while the sum is 39.

The square root of 2857638 is about 1690.4549683443. The cubic root of 2857638 is about 141.9065377177.

The spelling of 2857638 in words is "two million, eight hundred fifty-seven thousand, six hundred thirty-eight".