85786681 has 4 divisors (see below), whose sum is σ = 85805812. Its totient is φ = 85767552.

The previous prime is 85786667. The next prime is 85786693. The reversal of 85786681 is 18668758.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78943225 + 6843456 = 8885^2 + 2616^2 .

It is a cyclic number.

It is not a de Polignac number, because 85786681 - 2¹³ = 85778489 is a prime.

It is a super-2 number, since 2×85786681² = 14718709273991522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85786621) 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, 1201 + ... + 13153.

It is an arithmetic number, because the mean of its divisors is an integer number (21451453).

Almost surely, 2^85786681 is an apocalyptic number.

It is an amenable number.

85786681 is a deficient number, since it is larger than the sum of its proper divisors (19131).

85786681 is a wasteful number, since it uses less digits than its factorization.

85786681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19130.

The product of its digits is 645120, while the sum is 49.

The square root of 85786681 is about 9262.1099647974. The cubic root of 85786681 is about 441.0352362739.

The spelling of 85786681 in words is "eighty-five million, seven hundred eighty-six thousand, six hundred eighty-one".