2779140820 has 12 divisors (see below), whose sum is σ = 5836195764. Its totient is φ = 1111656320.

The previous prime is 2779140809. The next prime is 2779140823. The reversal of 2779140820 is 280419772.

It can be written as a sum of positive squares in 2 ways, for example, as 485497156 + 2293643664 = 22034^2 + 47892^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2779140823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69478501 + ... + 69478540.

It is an arithmetic number, because the mean of its divisors is an integer number (486349647).

Almost surely, 2^2779140820 is an apocalyptic number.

2779140820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2779140820 is an abundant number, since it is smaller than the sum of its proper divisors (3057054944).

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

2779140820 is a wasteful number, since it uses less digits than its factorization.

2779140820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138957050 (or 138957048 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2779140820 is about 52717.5570374804. The cubic root of 2779140820 is about 1405.9509981054.

The spelling of 2779140820 in words is "two billion, seven hundred seventy-nine million, one hundred forty thousand, eight hundred twenty".