84864987 has 6 divisors (see below), whose sum is σ = 122582772. Its totient is φ = 56576652.

The previous prime is 84864979. The next prime is 84865007. The reversal of 84864987 is 78946848.

It is not a de Polignac number, because 84864987 - 2³ = 84864979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84864907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4714713 + ... + 4714730.

It is an arithmetic number, because the mean of its divisors is an integer number (20430462).

Almost surely, 2^84864987 is an apocalyptic number.

84864987 is a deficient number, since it is larger than the sum of its proper divisors (37717785).

84864987 is a wasteful number, since it uses less digits than its factorization.

84864987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429449 (or 9429446 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 84864987 is about 9212.2194394185. The cubic root of 84864987 is about 439.4500480995.

The spelling of 84864987 in words is "eighty-four million, eight hundred sixty-four thousand, nine hundred eighty-seven".