85723987 has 4 divisors (see below), whose sum is σ = 85909600. Its totient is φ = 85538376.

The previous prime is 85723961. The next prime is 85723993. The reversal of 85723987 is 78932758.

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-85723987 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 85723987.

It is not an unprimeable number, because it can be changed into a prime (85723997) 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, 92112 + ... + 93037.

It is an arithmetic number, because the mean of its divisors is an integer number (21477400).

Almost surely, 2^85723987 is an apocalyptic number.

85723987 is a deficient number, since it is larger than the sum of its proper divisors (185613).

85723987 is a wasteful number, since it uses less digits than its factorization.

85723987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185612.

The product of its digits is 846720, while the sum is 49.

The square root of 85723987 is about 9258.7249122112. The cubic root of 85723987 is about 440.9277720333.

The spelling of 85723987 in words is "eighty-five million, seven hundred twenty-three thousand, nine hundred eighty-seven".