2774778864 has 80 divisors (see below), whose sum is σ = 8421377664. Its totient is φ = 776160000.

The previous prime is 2774778859. The next prime is 2774778887. The reversal of 2774778864 is 4688774772.

2774778864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2774778864² = 15398795488202260992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2774778798 and 2774778807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195262 + ... + 208989.

Almost surely, 2^2774778864 is an apocalyptic number.

2774778864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2774778864 is an abundant number, since it is smaller than the sum of its proper divisors (5646598800).

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

2774778864 is a wasteful number, since it uses less digits than its factorization.

2774778864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404286 (or 404280 counting only the distinct ones).

The product of its digits is 29503488, while the sum is 60.

The square root of 2774778864 is about 52676.1697924213. The cubic root of 2774778864 is about 1405.2150503093.

The spelling of 2774778864 in words is "two billion, seven hundred seventy-four million, seven hundred seventy-eight thousand, eight hundred sixty-four".