86542987 has 4 divisors (see below), whose sum is σ = 86658976. Its totient is φ = 86427000.

The previous prime is 86542943. The next prime is 86543003. The reversal of 86542987 is 78924568.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86542987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86542987.

It is not an unprimeable number, because it can be changed into a prime (86542927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56868 + ... + 58369.

It is an arithmetic number, because the mean of its divisors is an integer number (21664744).

Almost surely, 2^86542987 is an apocalyptic number.

86542987 is a deficient number, since it is larger than the sum of its proper divisors (115989).

86542987 is a wasteful number, since it uses less digits than its factorization.

86542987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115988.

The product of its digits is 967680, while the sum is 49.

The square root of 86542987 is about 9302.8483272598. The cubic root of 86542987 is about 442.3275197851.

The spelling of 86542987 in words is "eighty-six million, five hundred forty-two thousand, nine hundred eighty-seven".