7861657868 has 12 divisors (see below), whose sum is σ = 13858324872. Its totient is φ = 3902136480.

The previous prime is 7861657847. The next prime is 7861657883. The reversal of 7861657868 is 8687561687.

It is a self number, because there is not a number n which added to its sum of digits gives 7861657868.

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, 7172498 + ... + 7173593.

It is an arithmetic number, because the mean of its divisors is an integer number (1154860406).

Almost surely, 2^7861657868 is an apocalyptic number.

It is an amenable number.

7861657868 is a deficient number, since it is larger than the sum of its proper divisors (5996667004).

7861657868 is a wasteful number, since it uses less digits than its factorization.

7861657868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14346232 (or 14346230 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 62.

The square root of 7861657868 is about 88665.9904811309. The cubic root of 7861657868 is about 1988.4043898396.

The spelling of 7861657868 in words is "seven billion, eight hundred sixty-one million, six hundred fifty-seven thousand, eight hundred sixty-eight".