863891887 has 8 divisors (see below), whose sum is σ = 886784976. Its totient is φ = 841126272.

The previous prime is 863891881. The next prime is 863891909. The reversal of 863891887 is 788198368.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 863891887 - 2¹⁵ = 863859119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863891881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18058 + ... + 45319.

It is an arithmetic number, because the mean of its divisors is an integer number (110848122).

Almost surely, 2^863891887 is an apocalyptic number.

863891887 is a deficient number, since it is larger than the sum of its proper divisors (22893089).

863891887 is a wasteful number, since it uses less digits than its factorization.

863891887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63737.

The product of its digits is 4644864, while the sum is 58.

The square root of 863891887 is about 29392.0378163883. The cubic root of 863891887 is about 952.4009029752.

The spelling of 863891887 in words is "eight hundred sixty-three million, eight hundred ninety-one thousand, eight hundred eighty-seven".