2778879680 has 56 divisors (see below), whose sum is σ = 6830689920. Its totient is φ = 1075691520.

The previous prime is 2778879671. The next prime is 2778879703. The reversal of 2778879680 is 869788772.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130145 + ... + 149984.

Almost surely, 2^2778879680 is an apocalyptic number.

2778879680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778879680 is an abundant number, since it is smaller than the sum of its proper divisors (4051810240).

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

2778879680 is a wasteful number, since it uses less digits than its factorization.

2778879680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280177 (or 280167 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 62.

The square root of 2778879680 is about 52715.0801953293. The cubic root of 2778879680 is about 1405.9069603292.

The spelling of 2778879680 in words is "two billion, seven hundred seventy-eight million, eight hundred seventy-nine thousand, six hundred eighty".