6885866778 has 32 divisors (see below), whose sum is σ = 16281855360. Its totient is φ = 1899549120.

The previous prime is 6885866761. The next prime is 6885866783. The reversal of 6885866778 is 8776685886.

It is a happy number.

It is a super-2 number, since 2×6885866778² = 94830322568728202568, which contains 22 as substring.

It is a Curzon 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, 2825493 + ... + 2827928.

It is an arithmetic number, because the mean of its divisors is an integer number (508807980).

Almost surely, 2^6885866778 is an apocalyptic number.

6885866778 is an abundant number, since it is smaller than the sum of its proper divisors (9395988582).

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

6885866778 is a wasteful number, since it uses less digits than its factorization.

6885866778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653462.

The product of its digits is 216760320, while the sum is 69.

The square root of 6885866778 is about 82981.1230220464. The cubic root of 6885866778 is about 1902.4775415497.

The spelling of 6885866778 in words is "six billion, eight hundred eighty-five million, eight hundred sixty-six thousand, seven hundred seventy-eight".