7978980686 has 8 divisors (see below), whose sum is σ = 11970372240. Its totient is φ = 3988856608.

The previous prime is 7978980683. The next prime is 7978980689. The reversal of 7978980686 is 6860898797.

It is an interprime number because it is at equal distance from previous prime (7978980683) and next prime (7978980689).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7978980686² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978980683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 300971 + ... + 326406.

It is an arithmetic number, because the mean of its divisors is an integer number (1496296530).

Almost surely, 2^7978980686 is an apocalyptic number.

7978980686 is a deficient number, since it is larger than the sum of its proper divisors (3991391554).

7978980686 is a wasteful number, since it uses less digits than its factorization.

7978980686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633738.

The product of its (nonzero) digits is 73156608, while the sum is 68.

The square root of 7978980686 is about 89325.1402797667. The cubic root of 7978980686 is about 1998.2468541889.

The spelling of 7978980686 in words is "seven billion, nine hundred seventy-eight million, nine hundred eighty thousand, six hundred eighty-six".