2856816 has 80 divisors (see below), whose sum is σ = 8704800. Its totient is φ = 893952.

The previous prime is 2856809. The next prime is 2856823. The reversal of 2856816 is 6186582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2856809) and next prime (2856823).

It is a super-2 number, since 2×2856816² = 16322795315712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7150 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (108810).

2^2856816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2856816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4352400).

2856816 is an abundant number, since it is smaller than the sum of its proper divisors (5847984).

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

2856816 is a wasteful number, since it uses less digits than its factorization.

2856816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 411 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2856816 is about 1690.2118210449. The cubic root of 2856816 is about 141.8929299339.

The spelling of 2856816 in words is "two million, eight hundred fifty-six thousand, eight hundred sixteen".