2778998136 has 32 divisors (see below), whose sum is σ = 6948787200. Its totient is φ = 926160480.

The previous prime is 2778998071. The next prime is 2778998137. The reversal of 2778998136 is 6318998772.

It is a self number, because there is not a number n which added to its sum of digits gives 2778998136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778998137) 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, 245481 + ... + 256551.

It is an arithmetic number, because the mean of its divisors is an integer number (217149600).

Almost surely, 2^2778998136 is an apocalyptic number.

It is an amenable number.

2778998136 is an abundant number, since it is smaller than the sum of its proper divisors (4169789064).

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

2778998136 is a wasteful number, since it uses less digits than its factorization.

2778998136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21539 (or 21535 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 60.

The square root of 2778998136 is about 52716.2037328182. The cubic root of 2778998136 is about 1405.9269366947.

The spelling of 2778998136 in words is "two billion, seven hundred seventy-eight million, nine hundred ninety-eight thousand, one hundred thirty-six".