85640087 has 8 divisors (see below), whose sum is σ = 97082160. Its totient is φ = 74891520.

The previous prime is 85640081. The next prime is 85640099. The reversal of 85640087 is 78004658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85640087 - 2¹⁰ = 85639063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85640087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85640081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173114 + ... + 173607.

It is an arithmetic number, because the mean of its divisors is an integer number (12135270).

Almost surely, 2^85640087 is an apocalyptic number.

85640087 is a deficient number, since it is larger than the sum of its proper divisors (11442073).

85640087 is a wasteful number, since it uses less digits than its factorization.

85640087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346753.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 85640087 is about 9254.1929415806. The cubic root of 85640087 is about 440.7838764259.

The spelling of 85640087 in words is "eighty-five million, six hundred forty thousand, eighty-seven".