2878631 has 4 divisors (see below), whose sum is σ = 3289872. Its totient is φ = 2467392.

The previous prime is 2878613. The next prime is 2878639. The reversal of 2878631 is 1368782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2878631 is a prime.

It is a super-2 number, since 2×2878631² = 16573032868322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2878591 and 2878600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2878639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205610 + ... + 205623.

It is an arithmetic number, because the mean of its divisors is an integer number (822468).

2^2878631 is an apocalyptic number.

2878631 is a deficient number, since it is larger than the sum of its proper divisors (411241).

2878631 is an equidigital number, since it uses as much as digits as its factorization.

2878631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411240.

The product of its digits is 16128, while the sum is 35.

The square root of 2878631 is about 1696.6528814109. The cubic root of 2878631 is about 142.2531851486.

The spelling of 2878631 in words is "two million, eight hundred seventy-eight thousand, six hundred thirty-one".