86640590 has 16 divisors (see below), whose sum is σ = 158150880. Its totient is φ = 34167840.

The previous prime is 86640583. The next prime is 86640623. The reversal of 86640590 is 9504668.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60305 + ... + 61724.

It is an arithmetic number, because the mean of its divisors is an integer number (9884430).

Almost surely, 2^86640590 is an apocalyptic number.

86640590 is a deficient number, since it is larger than the sum of its proper divisors (71510290).

86640590 is a wasteful number, since it uses less digits than its factorization.

86640590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122107.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 86640590 is about 9308.0927154815. The cubic root of 86640590 is about 442.4937426632.

The spelling of 86640590 in words is "eighty-six million, six hundred forty thousand, five hundred ninety".