85870999 has 4 divisors (see below), whose sum is σ = 86130760. Its totient is φ = 85611240.

The previous prime is 85870919. The next prime is 85871011. The reversal of 85870999 is 99907858.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85870999 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 (85870909) 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, 129384 + ... + 130045.

It is an arithmetic number, because the mean of its divisors is an integer number (21532690).

Almost surely, 2^85870999 is an apocalyptic number.

85870999 is a deficient number, since it is larger than the sum of its proper divisors (259761).

85870999 is a wasteful number, since it uses less digits than its factorization.

85870999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259760.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 85870999 is about 9266.6606175040. The cubic root of 85870999 is about 441.1796838413.

The spelling of 85870999 in words is "eighty-five million, eight hundred seventy thousand, nine hundred ninety-nine".