7678987677 has 20 divisors (see below), whose sum is σ = 11490496380. Its totient is φ = 5110660224.

The previous prime is 7678987661. The next prime is 7678987697. The reversal of 7678987677 is 7767898767.

It can be written as a sum of positive squares in 2 ways, for example, as 5975444601 + 1703543076 = 77301^2 + 41274^2 .

It is not a de Polignac number, because 7678987677 - 2⁴ = 7678987661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7678987697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31902 + ... + 127967.

It is an arithmetic number, because the mean of its divisors is an integer number (574524819).

Almost surely, 2^7678987677 is an apocalyptic number.

It is an amenable number.

7678987677 is a deficient number, since it is larger than the sum of its proper divisors (3811508703).

7678987677 is a wasteful number, since it uses less digits than its factorization.

7678987677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160474 (or 160465 counting only the distinct ones).

The product of its digits is 348509952, while the sum is 72.

The square root of 7678987677 is about 87629.8332589992. The cubic root of 7678987677 is about 1972.8829680439.

The spelling of 7678987677 in words is "seven billion, six hundred seventy-eight million, nine hundred eighty-seven thousand, six hundred seventy-seven".