7897667986 has 8 divisors (see below), whose sum is σ = 12757771404. Its totient is φ = 3645077520.

The previous prime is 7897667963. The next prime is 7897668001. The reversal of 7897667986 is 6897667987.

It can be written as a sum of positive squares in 2 ways, for example, as 7410627225 + 487040761 = 86085^2 + 22069^2 .

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

It is an unprimeable number.

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, 151878205 + ... + 151878256.

Almost surely, 2^7897667986 is an apocalyptic number.

7897667986 is a deficient number, since it is larger than the sum of its proper divisors (4860103418).

7897667986 is a wasteful number, since it uses less digits than its factorization.

7897667986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303756476.

The product of its digits is 384072192, while the sum is 73.

The square root of 7897667986 is about 88868.8246012065. The cubic root of 7897667986 is about 1991.4357109907.

Subtracting from 7897667986 its reverse (6897667987), we obtain a palindrome (999999999).

The spelling of 7897667986 in words is "seven billion, eight hundred ninety-seven million, six hundred sixty-seven thousand, nine hundred eighty-six".