685704081 has 4 divisors (see below), whose sum is σ = 914272112. Its totient is φ = 457136052.

The previous prime is 685704079. The next prime is 685704113. The reversal of 685704081 is 180407586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 685704081 - 2¹ = 685704079 is a prime.

It is a super-2 number, since 2×685704081² = 940380173400109122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685704181) 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, 114284011 + ... + 114284016.

It is an arithmetic number, because the mean of its divisors is an integer number (228568028).

Almost surely, 2^685704081 is an apocalyptic number.

It is an amenable number.

685704081 is a deficient number, since it is larger than the sum of its proper divisors (228568031).

685704081 is a wasteful number, since it uses less digits than its factorization.

685704081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228568030.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 685704081 is about 26185.9519781122. The cubic root of 685704081 is about 881.8179022054.

The spelling of 685704081 in words is "six hundred eighty-five million, seven hundred four thousand, eighty-one".