86640687 has 24 divisors (see below), whose sum is σ = 151441056. Its totient is φ = 46596096.

The previous prime is 86640683. The next prime is 86640689. The reversal of 86640687 is 78604668.

It is a happy number.

It is not a de Polignac number, because 86640687 - 2² = 86640683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86640683) 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 23 ways as a sum of consecutive naturals, for example, 39378 + ... + 41519.

It is an arithmetic number, because the mean of its divisors is an integer number (6310044).

Almost surely, 2^86640687 is an apocalyptic number.

86640687 is a deficient number, since it is larger than the sum of its proper divisors (64800369).

86640687 is a wasteful number, since it uses less digits than its factorization.

86640687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80927 (or 80924 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 86640687 is about 9308.0979259997. The cubic root of 86640687 is about 442.4939077970.

The spelling of 86640687 in words is "eighty-six million, six hundred forty thousand, six hundred eighty-seven".