7866275778 has 48 divisors (see below), whose sum is σ = 17474330016. Its totient is φ = 2556066240.

The previous prime is 7866275773. The next prime is 7866275803. The reversal of 7866275778 is 8775726687.

It is not an unprimeable number, because it can be changed into a prime (7866275771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393501 + ... + 413007.

It is an arithmetic number, because the mean of its divisors is an integer number (364048542).

Almost surely, 2^7866275778 is an apocalyptic number.

7866275778 is an abundant number, since it is smaller than the sum of its proper divisors (9608054238).

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

7866275778 is a wasteful number, since it uses less digits than its factorization.

7866275778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20079 (or 20076 counting only the distinct ones).

The product of its digits is 55319040, while the sum is 63.

The square root of 7866275778 is about 88692.0277026070. The cubic root of 7866275778 is about 1988.7936408677.

The spelling of 7866275778 in words is "seven billion, eight hundred sixty-six million, two hundred seventy-five thousand, seven hundred seventy-eight".