2780778120 has 64 divisors (see below), whose sum is σ = 8611453440. Its totient is φ = 717619200.

The previous prime is 2780778113. The next prime is 2780778139. The reversal of 2780778120 is 218770872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370041 + ... + 377480.

It is an arithmetic number, because the mean of its divisors is an integer number (134553960).

Almost surely, 2^2780778120 is an apocalyptic number.

2780778120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780778120 is an abundant number, since it is smaller than the sum of its proper divisors (5830675320).

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

2780778120 is a wasteful number, since it uses less digits than its factorization.

2780778120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747566 (or 747562 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 2780778120 is about 52733.0837330797. The cubic root of 2780778120 is about 1406.2270440500.

The spelling of 2780778120 in words is "two billion, seven hundred eighty million, seven hundred seventy-eight thousand, one hundred twenty".