7138181868 has 48 divisors (see below), whose sum is σ = 16921868544. Its totient is φ = 2341662400.

The previous prime is 7138181837. The next prime is 7138181873. The reversal of 7138181868 is 8681818317.

It is a self number, because there is not a number n which added to its sum of digits gives 7138181868.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184771 + ... + 220037.

It is an arithmetic number, because the mean of its divisors is an integer number (352538928).

Almost surely, 2^7138181868 is an apocalyptic number.

It is an amenable number.

7138181868 is an abundant number, since it is smaller than the sum of its proper divisors (9783686676).

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

7138181868 is a wasteful number, since it uses less digits than its factorization.

7138181868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35542 (or 35540 counting only the distinct ones).

The product of its digits is 516096, while the sum is 51.

The square root of 7138181868 is about 84487.7616462882. The cubic root of 7138181868 is about 1925.4365113879.

The spelling of 7138181868 in words is "seven billion, one hundred thirty-eight million, one hundred eighty-one thousand, eight hundred sixty-eight".