84657987 has 16 divisors (see below), whose sum is σ = 125966880. Its totient is φ = 56192256.

The previous prime is 84657973. The next prime is 84657997. The reversal of 84657987 is 78975648.

It is not a de Polignac number, because 84657987 - 2⁴ = 84657971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84657967) 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 15 ways as a sum of consecutive naturals, for example, 438 + ... + 13019.

It is an arithmetic number, because the mean of its divisors is an integer number (7872930).

Almost surely, 2^84657987 is an apocalyptic number.

84657987 is a deficient number, since it is larger than the sum of its proper divisors (41308893).

84657987 is a wasteful number, since it uses less digits than its factorization.

84657987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13699 (or 13693 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 84657987 is about 9200.9775024179. The cubic root of 84657987 is about 439.0924596359.

The spelling of 84657987 in words is "eighty-four million, six hundred fifty-seven thousand, nine hundred eighty-seven".