85891387 has 4 divisors (see below), whose sum is σ = 87173416. Its totient is φ = 84609360.

The previous prime is 85891357. The next prime is 85891411. The reversal of 85891387 is 78319858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78319858 = 2 ⋅39159929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85891387 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 85891387.

It is not an unprimeable number, because it can be changed into a prime (85891307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640914 + ... + 641047.

It is an arithmetic number, because the mean of its divisors is an integer number (21793354).

Almost surely, 2^85891387 is an apocalyptic number.

85891387 is a deficient number, since it is larger than the sum of its proper divisors (1282029).

85891387 is a wasteful number, since it uses less digits than its factorization.

85891387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282028.

The product of its digits is 483840, while the sum is 49.

The square root of 85891387 is about 9267.7606248759. The cubic root of 85891387 is about 441.2145969076.

The spelling of 85891387 in words is "eighty-five million, eight hundred ninety-one thousand, three hundred eighty-seven".