2808631 has 18 divisors (see below), whose sum is σ = 3452832. Its totient is φ = 2275560.

The previous prime is 2808607. The next prime is 2808647. The reversal of 2808631 is 1368082.

It is not a de Polignac number, because 2808631 - 2⁹ = 2808119 is a prime.

It is a super-2 number, since 2×2808631² = 15776816188322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2808631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2808601) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 65296 + ... + 65338.

It is an arithmetic number, because the mean of its divisors is an integer number (191824).

2^2808631 is an apocalyptic number.

2808631 is a deficient number, since it is larger than the sum of its proper divisors (644201).

2808631 is an equidigital number, since it uses as much as digits as its factorization.

2808631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 2808631 is about 1675.8970732118. The cubic root of 2808631 is about 141.0906480800.

It can be divided in two parts, 280 and 8631, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 2808631 in words is "two million, eight hundred eight thousand, six hundred thirty-one".