7863687221 has 16 divisors (see below), whose sum is σ = 8829063936. Its totient is φ = 6956179776.

The previous prime is 7863687217. The next prime is 7863687269. The reversal of 7863687221 is 1227863687.

It is not a de Polignac number, because 7863687221 - 2² = 7863687217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7863687221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7863687521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103085 + ... + 162338.

It is an arithmetic number, because the mean of its divisors is an integer number (551816496).

Almost surely, 2^7863687221 is an apocalyptic number.

It is an amenable number.

7863687221 is a deficient number, since it is larger than the sum of its proper divisors (965376715).

7863687221 is a wasteful number, since it uses less digits than its factorization.

7863687221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265532.

The product of its digits is 1354752, while the sum is 50.

The square root of 7863687221 is about 88677.4335499173. The cubic root of 7863687221 is about 1988.5754660225.

The spelling of 7863687221 in words is "seven billion, eight hundred sixty-three million, six hundred eighty-seven thousand, two hundred twenty-one".