2778456 has 16 divisors (see below), whose sum is σ = 6946200. Its totient is φ = 926144.

The previous prime is 2778439. The next prime is 2778467. The reversal of 2778456 is 6548772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57861 + ... + 57908.

2^2778456 is an apocalyptic number.

It is an amenable number.

2778456 is an abundant number, since it is smaller than the sum of its proper divisors (4167744).

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

2778456 is a wasteful number, since it uses less digits than its factorization.

2778456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115778 (or 115774 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 2778456 is about 1666.8701209152. The cubic root of 2778456 is about 140.5835506482.

The spelling of 2778456 in words is "two million, seven hundred seventy-eight thousand, four hundred fifty-six".