85787689 has 4 divisors (see below), whose sum is σ = 92386756. Its totient is φ = 79188624.

The previous prime is 85787659. The next prime is 85787743. The reversal of 85787689 is 98678758.

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 46512400 + 39275289 = 6820^2 + 6267^2 .

It is a cyclic number.

It is not a de Polignac number, because 85787689 - 2¹⁹ = 85263401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85787659) 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, 3299514 + ... + 3299539.

It is an arithmetic number, because the mean of its divisors is an integer number (23096689).

Almost surely, 2^85787689 is an apocalyptic number.

It is an amenable number.

85787689 is a deficient number, since it is larger than the sum of its proper divisors (6599067).

85787689 is a wasteful number, since it uses less digits than its factorization.

85787689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599066.

The product of its digits is 6773760, while the sum is 58.

The square root of 85787689 is about 9262.1643798844. The cubic root of 85787689 is about 441.0369636662.

The spelling of 85787689 in words is "eighty-five million, seven hundred eighty-seven thousand, six hundred eighty-nine".