2656778980 has 24 divisors (see below), whose sum is σ = 5587134840. Its totient is φ = 1061207040.

The previous prime is 2656778953. The next prime is 2656778983. The reversal of 2656778980 is 898776562.

It can be written as a sum of positive squares in 4 ways, for example, as 434222244 + 2222556736 = 20838^2 + 47144^2 .

It is not an unprimeable number, because it can be changed into a prime (2656778983) 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, 79501 + ... + 107860.

It is an arithmetic number, because the mean of its divisors is an integer number (232797285).

Almost surely, 2^2656778980 is an apocalyptic number.

2656778980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656778980 is an abundant number, since it is smaller than the sum of its proper divisors (2930355860).

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

2656778980 is a wasteful number, since it uses less digits than its factorization.

2656778980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188079 (or 188077 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The square root of 2656778980 is about 51543.9519245469. The cubic root of 2656778980 is about 1385.0064912137.

The spelling of 2656778980 in words is "two billion, six hundred fifty-six million, seven hundred seventy-eight thousand, nine hundred eighty".