86487989 has 6 divisors (see below), whose sum is σ = 100608534. Its totient is φ = 74132520.

The previous prime is 86487979. The next prime is 86488021. The reversal of 86487989 is 98978468.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 8076964 = 8855^2 + 2842^2 .

It is a de Polignac number, because none of the positive numbers 2^k-86487989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86487949) 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, 882482 + ... + 882579.

It is an arithmetic number, because the mean of its divisors is an integer number (16768089).

Almost surely, 2^86487989 is an apocalyptic number.

It is an amenable number.

86487989 is a deficient number, since it is larger than the sum of its proper divisors (14120545).

86487989 is a wasteful number, since it uses less digits than its factorization.

86487989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765075 (or 1765068 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 59.

The square root of 86487989 is about 9299.8918810920. The cubic root of 86487989 is about 442.2338003327.

The spelling of 86487989 in words is "eighty-six million, four hundred eighty-seven thousand, nine hundred eighty-nine".