7999999992 has 80 divisors (see below), whose sum is σ = 23013081960. Its totient is φ = 2594586816.

The previous prime is 7999999957. The next prime is 8000000011. The reversal of 7999999992 is 2999999997.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 142858 + ... + 190809.

Almost surely, 2^7999999992 is an apocalyptic number.

7999999992 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

7999999992 is an abundant number, since it is smaller than the sum of its proper divisors (15013081968).

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

7999999992 is a wasteful number, since it uses less digits than its factorization.

7999999992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333722 (or 333709 counting only the distinct ones).

The product of its digits is 602654094, while the sum is 81.

The square root of 7999999992 is about 89442.7190552702. The cubic root of 7999999992 is about 1999.9999993333. Note that the first 6 decimals are identical.

It can be divided in two parts, 7 and 999999992, that added together give a palindrome (999999999).

The spelling of 7999999992 in words is "seven billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-two".