2787979827205 has 16 divisors (see below), whose sum is σ = 3542444221680. Its totient is φ = 2099143416832.

The previous prime is 2787979827173. The next prime is 2787979827233. The reversal of 2787979827205 is 5027289797872.

2787979827205 = 1180673² + 1180674².

It can be written as a sum of positive squares in 8 ways, for example, as 27709930369 + 2760269896836 = 166463^2 + 1661406^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787979827205 - 2⁵ = 2787979827173 is a prime.

It is a super-2 number, since 2×2787979827205² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4419207 + ... + 5010523.

It is an arithmetic number, because the mean of its divisors is an integer number (221402763855).

Almost surely, 2^{2787979827205} is an apocalyptic number.

2787979827205 is the 1180674-th centered square number.

It is an amenable number.

2787979827205 is a deficient number, since it is larger than the sum of its proper divisors (754464394475).

2787979827205 is a wasteful number, since it uses less digits than its factorization.

2787979827205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646808.

The product of its (nonzero) digits is 497871360, while the sum is 73.

The spelling of 2787979827205 in words is "two trillion, seven hundred eighty-seven billion, nine hundred seventy-nine million, eight hundred twenty-seven thousand, two hundred five".