857284685 has 4 divisors (see below), whose sum is σ = 1028741628. Its totient is φ = 685827744.

The previous prime is 857284661. The next prime is 857284697. The reversal of 857284685 is 586482758.

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 568488649 + 288796036 = 23843^2 + 16994^2 .

It is a cyclic number.

It is not a de Polignac number, because 857284685 - 2²⁰ = 856236109 is a prime.

It is a super-2 number, since 2×857284685² = 1469874062271098450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85728464 + ... + 85728473.

It is an arithmetic number, because the mean of its divisors is an integer number (257185407).

Almost surely, 2^857284685 is an apocalyptic number.

It is an amenable number.

857284685 is a deficient number, since it is larger than the sum of its proper divisors (171456943).

857284685 is a wasteful number, since it uses less digits than its factorization.

857284685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171456942.

The product of its digits is 4300800, while the sum is 53.

The square root of 857284685 is about 29279.4242600499. The cubic root of 857284685 is about 949.9666414879.

The spelling of 857284685 in words is "eight hundred fifty-seven million, two hundred eighty-four thousand, six hundred eighty-five".