86987842 has 12 divisors (see below), whose sum is σ = 132471990. Its totient is φ = 42840336.

The previous prime is 86987821. The next prime is 86987843. The reversal of 86987842 is 24878968.

It can be written as a sum of positive squares in only one way, i.e., 72403081 + 14584761 = 8509^2 + 3819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 86987842.

It is not an unprimeable number, because it can be changed into a prime (86987843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4134 + ... + 13822.

Almost surely, 2^86987842 is an apocalyptic number.

86987842 is a deficient number, since it is larger than the sum of its proper divisors (45484148).

86987842 is an equidigital number, since it uses as much as digits as its factorization.

86987842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9825 (or 9758 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

The square root of 86987842 is about 9326.7272931077. The cubic root of 86987842 is about 443.0841203354.

The spelling of 86987842 in words is "eighty-six million, nine hundred eighty-seven thousand, eight hundred forty-two".