86987805 has 16 divisors (see below), whose sum is σ = 139299264. Its totient is φ = 46353920.

The previous prime is 86987801. The next prime is 86987821. The reversal of 86987805 is 50878968.

It is a happy number.

It is not a de Polignac number, because 86987805 - 2² = 86987801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86987801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27085 + ... + 30125.

It is an arithmetic number, because the mean of its divisors is an integer number (8706204).

Almost surely, 2^86987805 is an apocalyptic number.

It is an amenable number.

86987805 is a deficient number, since it is larger than the sum of its proper divisors (52311459).

86987805 is a wasteful number, since it uses less digits than its factorization.

86987805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4956.

The product of its (nonzero) digits is 967680, while the sum is 51.

The square root of 86987805 is about 9326.7253095607. The cubic root of 86987805 is about 443.0840575139.

The spelling of 86987805 in words is "eighty-six million, nine hundred eighty-seven thousand, eight hundred five".