85417987 has 4 divisors (see below), whose sum is σ = 85462840. Its totient is φ = 85373136.

The previous prime is 85417973. The next prime is 85418009. The reversal of 85417987 is 78971458.

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

It is a cyclic number.

It is not a de Polignac number, because 85417987 - 2¹⁵ = 85385219 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 85417987.

It is not an unprimeable number, because it can be changed into a prime (85417967) 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, 19437 + ... + 23422.

It is an arithmetic number, because the mean of its divisors is an integer number (21365710).

Almost surely, 2^85417987 is an apocalyptic number.

85417987 is a deficient number, since it is larger than the sum of its proper divisors (44853).

85417987 is a wasteful number, since it uses less digits than its factorization.

85417987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44852.

The product of its digits is 564480, while the sum is 49.

The square root of 85417987 is about 9242.1851853336. The cubic root of 85417987 is about 440.4025018674.

The spelling of 85417987 in words is "eighty-five million, four hundred seventeen thousand, nine hundred eighty-seven".