2779220808 has 240 divisors, whose sum is σ = 9753323580. Its totient is φ = 732872448.

The previous prime is 2779220789. The next prime is 2779220819. The reversal of 2779220808 is 8080229772.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2707953444 + 71267364 = 52038^2 + 8442^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 409410 + ... + 416142.

Almost surely, 2^2779220808 is an apocalyptic number.

2779220808 is a gapful number since it is divisible by the number (28) 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 2779220808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4876661790).

2779220808 is an abundant number, since it is smaller than the sum of its proper divisors (6974102772).

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

2779220808 is a wasteful number, since it uses less digits than its factorization.

2779220808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778 (or 6758 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 2779220808 is about 52718.3156787089. The cubic root of 2779220808 is about 1405.9644864622.

The spelling of 2779220808 in words is "two billion, seven hundred seventy-nine million, two hundred twenty thousand, eight hundred eight".