2787766391664 has 30 divisors (see below), whose sum is σ = 7801873999296. Its totient is φ = 929255463840.

The previous prime is 2787766391653. The next prime is 2787766391671. The reversal of 2787766391664 is 4661936677872.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 2787766391592 and 2787766391601.

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 5 ways as a sum of consecutive naturals, for example, 9679744272 + ... + 9679744559.

Almost surely, 2^{2787766391664} is an apocalyptic number.

2787766391664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2787766391664 is an abundant number, since it is smaller than the sum of its proper divisors (5014107607632).

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

2787766391664 is a wasteful number, since it uses less digits than its factorization.

2787766391664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19359488845 (or 19359488836 counting only the distinct ones).

The product of its digits is 768144384, while the sum is 72.

The spelling of 2787766391664 in words is "two trillion, seven hundred eighty-seven billion, seven hundred sixty-six million, three hundred ninety-one thousand, six hundred sixty-four".