85687381 has 8 divisors (see below), whose sum is σ = 92678040. Its totient is φ = 78753792.

The previous prime is 85687339. The next prime is 85687403. The reversal of 85687381 is 18378658.

It can be written as a sum of positive squares in 4 ways, for example, as 8071281 + 77616100 = 2841^2 + 8810^2 .

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

It is not a de Polignac number, because 85687381 - 2¹⁹ = 85163093 is a prime.

It is a super-2 number, since 2×85687381² = 14684654525278322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85684381) 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, 11116 + ... + 17173.

It is an arithmetic number, because the mean of its divisors is an integer number (11584755).

Almost surely, 2^85687381 is an apocalyptic number.

It is an amenable number.

85687381 is a deficient number, since it is larger than the sum of its proper divisors (6990659).

85687381 is a wasteful number, since it uses less digits than its factorization.

85687381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28535.

The product of its digits is 322560, while the sum is 46.

The square root of 85687381 is about 9256.7478630456. The cubic root of 85687381 is about 440.8650011933.

It can be divided in two parts, 85687 and 381, that added together give a palindrome (86068).

The spelling of 85687381 in words is "eighty-five million, six hundred eighty-seven thousand, three hundred eighty-one".