86512987 has 4 divisors (see below), whose sum is σ = 94377816. Its totient is φ = 78648160.

The previous prime is 86512969. The next prime is 86512991. The reversal of 86512987 is 78921568.

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

It is a cyclic number.

It is not a de Polignac number, because 86512987 - 2⁷ = 86512859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86512927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3932398 + ... + 3932419.

It is an arithmetic number, because the mean of its divisors is an integer number (23594454).

Almost surely, 2^86512987 is an apocalyptic number.

86512987 is a deficient number, since it is larger than the sum of its proper divisors (7864829).

86512987 is a wasteful number, since it uses less digits than its factorization.

86512987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7864828.

The product of its digits is 241920, while the sum is 46.

The square root of 86512987 is about 9301.2357781103. The cubic root of 86512987 is about 442.2764031487.

The spelling of 86512987 in words is "eighty-six million, five hundred twelve thousand, nine hundred eighty-seven".