2778346856 has 32 divisors (see below), whose sum is σ = 5706045000. Its totient is φ = 1262370816.

The previous prime is 2778346853. The next prime is 2778346859. The reversal of 2778346856 is 6586438772.

It is an interprime number because it is at equal distance from previous prime (2778346853) and next prime (2778346859).

It can be written as a sum of positive squares in 4 ways, for example, as 2034912100 + 743434756 = 45110^2 + 27266^2 .

It is a super-2 number, since 2×2778346856² = 15438422504490169472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2778346853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348281 + ... + 356168.

Almost surely, 2^2778346856 is an apocalyptic number.

It is an amenable number.

2778346856 is an abundant number, since it is smaller than the sum of its proper divisors (2927698144).

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

2778346856 is a wasteful number, since it uses less digits than its factorization.

2778346856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704501 (or 704497 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 56.

The square root of 2778346856 is about 52710.0261430404. The cubic root of 2778346856 is about 1405.8170981138.

The spelling of 2778346856 in words is "two billion, seven hundred seventy-eight million, three hundred forty-six thousand, eight hundred fifty-six".