7998991814 has 32 divisors (see below), whose sum is σ = 13635578880. Its totient is φ = 3486304800.

The previous prime is 7998991813. The next prime is 7998991823. The reversal of 7998991814 is 4181998997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998991813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20537 + ... + 128139.

It is an arithmetic number, because the mean of its divisors is an integer number (426111840).

Almost surely, 2^7998991814 is an apocalyptic number.

7998991814 is a deficient number, since it is larger than the sum of its proper divisors (5636587066).

7998991814 is a wasteful number, since it uses less digits than its factorization.

7998991814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107756.

The product of its digits is 11757312, while the sum is 65.

The square root of 7998991814 is about 89437.0829913409. The cubic root of 7998991814 is about 1999.9159809705.

The spelling of 7998991814 in words is "seven billion, nine hundred ninety-eight million, nine hundred ninety-one thousand, eight hundred fourteen".