7999988 has 12 divisors (see below), whose sum is σ = 14736960. Its totient is φ = 3789432.

The previous prime is 7999963. The next prime is 7999993. The reversal of 7999988 is 8899997.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52556 + ... + 52707.

It is an arithmetic number, because the mean of its divisors is an integer number (1228080).

Almost surely, 2^7999988 is an apocalyptic number.

It is an amenable number.

7999988 is a deficient number, since it is larger than the sum of its proper divisors (6736972).

7999988 is a wasteful number, since it uses less digits than its factorization.

7999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105286 (or 105284 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 59.

The square root of 7999988 is about 2828.4250034251. The cubic root of 7999988 is about 199.9998999999. Note that the first 3 decimals are identical.

Subtracting 7999988 from its reverse (8899997), we obtain a palindrome (900009).

The spelling of 7999988 in words is "seven million, nine hundred ninety-nine thousand, nine hundred eighty-eight".