7999879999 has 8 divisors (see below), whose sum is σ = 8288627760. Its totient is φ = 7711991616.

The previous prime is 7999879973. The next prime is 7999880027. The reversal of 7999879999 is 9999789997.

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

It is a cyclic number.

It is not a de Polignac number, because 7999879999 - 2²⁹ = 7463009087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999879919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195862 + ... + 233155.

It is an arithmetic number, because the mean of its divisors is an integer number (1036078470).

Almost surely, 2^7999879999 is an apocalyptic number.

7999879999 is a deficient number, since it is larger than the sum of its proper divisors (288747761).

7999879999 is a wasteful number, since it uses less digits than its factorization.

7999879999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429689.

The product of its digits is 1874923848, while the sum is 85.

The square root of 7999879999 is about 89442.0482714925. The cubic root of 7999879999 is about 1999.9899998667.

The spelling of 7999879999 in words is "seven billion, nine hundred ninety-nine million, eight hundred seventy-nine thousand, nine hundred ninety-nine".