2787866556 has 12 divisors (see below), whose sum is σ = 6505021992. Its totient is φ = 929288848.

The previous prime is 2787866519. The next prime is 2787866573. The reversal of 2787866556 is 6556687872.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2787866556² = 15544399868126602272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2787866556.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116161095 + ... + 116161118.

It is an arithmetic number, because the mean of its divisors is an integer number (542085166).

Almost surely, 2^2787866556 is an apocalyptic number.

It is an amenable number.

2787866556 is an abundant number, since it is smaller than the sum of its proper divisors (3717155436).

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

2787866556 is a wasteful number, since it uses less digits than its factorization.

2787866556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232322220 (or 232322218 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 60.

The square root of 2787866556 is about 52800.2514766739. The cubic root of 2787866556 is about 1407.4208936650.

The spelling of 2787866556 in words is "two billion, seven hundred eighty-seven million, eight hundred sixty-six thousand, five hundred fifty-six".