3867776778 has 16 divisors (see below), whose sum is σ = 7737420960. Its totient is φ = 1288947696.

The previous prime is 3867776767. The next prime is 3867776789. The reversal of 3867776778 is 8776777683.

It is an interprime number because it is at equal distance from previous prime (3867776767) and next prime (3867776789).

It is a super-2 number, since 2×3867776778² = 29919394408872122568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50125 + ... + 101232.

It is an arithmetic number, because the mean of its divisors is an integer number (483588810).

Almost surely, 2^3867776778 is an apocalyptic number.

3867776778 is an abundant number, since it is smaller than the sum of its proper divisors (3869644182).

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

3867776778 is a wasteful number, since it uses less digits than its factorization.

3867776778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155621.

The product of its digits is 116169984, while the sum is 66.

The square root of 3867776778 is about 62191.4526120752. The cubic root of 3867776778 is about 1569.7137669055.

The spelling of 3867776778 in words is "three billion, eight hundred sixty-seven million, seven hundred seventy-six thousand, seven hundred seventy-eight".