7998649686 has 24 divisors (see below), whose sum is σ = 17332057704. Its totient is φ = 2665962720.

The previous prime is 7998649669. The next prime is 7998649693. The reversal of 7998649686 is 6869468997.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337506 + ... + 360426.

It is an arithmetic number, because the mean of its divisors is an integer number (722169071).

Almost surely, 2^7998649686 is an apocalyptic number.

7998649686 is an abundant number, since it is smaller than the sum of its proper divisors (9333408018).

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

7998649686 is a wasteful number, since it uses less digits than its factorization.

7998649686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42316 (or 42313 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The square root of 7998649686 is about 89435.1702967015. The cubic root of 7998649686 is about 1999.8874675017.

The spelling of 7998649686 in words is "seven billion, nine hundred ninety-eight million, six hundred forty-nine thousand, six hundred eighty-six".