864812473987 has 24 divisors (see below), whose sum is σ = 1112495239152. Its totient is φ = 664648588800.

The previous prime is 864812473969. The next prime is 864812474003. The reversal of 864812473987 is 789374218468.

It is not a de Polignac number, because 864812473987 - 2¹⁵ = 864812441219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864812471987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10950214 + ... + 11028907.

It is an arithmetic number, because the mean of its divisors is an integer number (46353968298).

Almost surely, 2^864812473987 is an apocalyptic number.

864812473987 is a deficient number, since it is larger than the sum of its proper divisors (247682765165).

864812473987 is a wasteful number, since it uses less digits than its factorization.

864812473987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21979219 (or 21979212 counting only the distinct ones).

The product of its digits is 130056192, while the sum is 67.

The spelling of 864812473987 in words is "eight hundred sixty-four billion, eight hundred twelve million, four hundred seventy-three thousand, nine hundred eighty-seven".