84997287 has 6 divisors (see below), whose sum is σ = 122773872. Its totient is φ = 56664852.

The previous prime is 84997273. The next prime is 84997307. The reversal of 84997287 is 78279948.

84997287 is a `hidden beast` number, since 8 + 499 + 72 + 87 = 666.

It is not a de Polignac number, because 84997287 - 2⁴ = 84997271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84997207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4722063 + ... + 4722080.

It is an arithmetic number, because the mean of its divisors is an integer number (20462312).

Almost surely, 2^84997287 is an apocalyptic number.

84997287 is a deficient number, since it is larger than the sum of its proper divisors (37776585).

84997287 is a wasteful number, since it uses less digits than its factorization.

84997287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9444149 (or 9444146 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 84997287 is about 9219.3973230358. The cubic root of 84997287 is about 439.6782892841.

The spelling of 84997287 in words is "eighty-four million, nine hundred ninety-seven thousand, two hundred eighty-seven".