686494894 has 4 divisors (see below), whose sum is σ = 1029742344. Its totient is φ = 343247446.

The previous prime is 686494859. The next prime is 686494927. The reversal of 686494894 is 498494686.

686494894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171623722 + ... + 171623725.

It is an arithmetic number, because the mean of its divisors is an integer number (257435586).

Almost surely, 2^686494894 is an apocalyptic number.

686494894 is a deficient number, since it is larger than the sum of its proper divisors (343247450).

686494894 is a wasteful number, since it uses less digits than its factorization.

686494894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343247449.

The product of its digits is 11943936, while the sum is 58.

The square root of 686494894 is about 26201.0475744769. The cubic root of 686494894 is about 882.1567680851.

The spelling of 686494894 in words is "six hundred eighty-six million, four hundred ninety-four thousand, eight hundred ninety-four".