2678947779 has 8 divisors (see below), whose sum is σ = 3600056320. Its totient is φ = 1771902216.

The previous prime is 2678947763. The next prime is 2678947781. The reversal of 2678947779 is 9777498762.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2678947779 - 2⁴ = 2678947763 is a prime.

It is a super-2 number, since 2×2678947779² = 14353522405218065682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2678947759) 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, 3515299 + ... + 3516060.

It is an arithmetic number, because the mean of its divisors is an integer number (450007040).

Almost surely, 2^2678947779 is an apocalyptic number.

2678947779 is a deficient number, since it is larger than the sum of its proper divisors (921108541).

2678947779 is a wasteful number, since it uses less digits than its factorization.

2678947779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7031489.

The product of its digits is 74680704, while the sum is 66.

The square root of 2678947779 is about 51758.5527135371. The cubic root of 2678947779 is about 1388.8481009393.

The spelling of 2678947779 in words is "two billion, six hundred seventy-eight million, nine hundred forty-seven thousand, seven hundred seventy-nine".