2779868 has 36 divisors (see below), whose sum is σ = 6099912. Its totient is φ = 1098720.

The previous prime is 2779859. The next prime is 2779873. The reversal of 2779868 is 8689772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2003 + ... + 3093.

It is an arithmetic number, because the mean of its divisors is an integer number (169442).

2^2779868 is an apocalyptic number.

2779868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2779868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3049956).

2779868 is an abundant number, since it is smaller than the sum of its proper divisors (3320044).

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

2779868 is a wasteful number, since it uses less digits than its factorization.

2779868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1113 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 2779868 is about 1667.2936154139. The cubic root of 2779868 is about 140.6073612774.

The spelling of 2779868 in words is "two million, seven hundred seventy-nine thousand, eight hundred sixty-eight".