7991888 has 10 divisors (see below), whose sum is σ = 15484314. Its totient is φ = 3995936.

The previous prime is 7991869. The next prime is 7991891. The reversal of 7991888 is 8881997.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5895184 + 2096704 = 2428^2 + 1448^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249731 + ... + 249762.

Almost surely, 2^7991888 is an apocalyptic number.

It is an amenable number.

7991888 is a deficient number, since it is larger than the sum of its proper divisors (7492426).

7991888 is a wasteful number, since it uses less digits than its factorization.

7991888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499501 (or 499495 counting only the distinct ones).

The product of its digits is 290304, while the sum is 50.

The square root of 7991888 is about 2826.9927484873. The cubic root of 7991888 is about 199.9323771383.

The spelling of 7991888 in words is "seven million, nine hundred ninety-one thousand, eight hundred eighty-eight".