2778496980 has 144 divisors (see below), whose sum is σ = 9073451520. Its totient is φ = 633437952.

The previous prime is 2778496969. The next prime is 2778496999. The reversal of 2778496980 is 896948772.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1407274 + ... + 1409246.

It is an arithmetic number, because the mean of its divisors is an integer number (63010080).

Almost surely, 2^2778496980 is an apocalyptic number.

2778496980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2778496980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4536725760).

2778496980 is an abundant number, since it is smaller than the sum of its proper divisors (6294954540).

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

2778496980 is a wasteful number, since it uses less digits than its factorization.

2778496980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The square root of 2778496980 is about 52711.4501792542. The cubic root of 2778496980 is about 1405.8424180968.

The spelling of 2778496980 in words is "two billion, seven hundred seventy-eight million, four hundred ninety-six thousand, nine hundred eighty".