685278086 has 4 divisors (see below), whose sum is σ = 1027917132. Its totient is φ = 342639042.

The previous prime is 685278071. The next prime is 685278101. The reversal of 685278086 is 680872586.

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

It is an interprime number because it is at equal distance from previous prime (685278071) and next prime (685278101).

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, 171319520 + ... + 171319523.

It is an arithmetic number, because the mean of its divisors is an integer number (256979283).

Almost surely, 2^685278086 is an apocalyptic number.

685278086 is a deficient number, since it is larger than the sum of its proper divisors (342639046).

685278086 is a wasteful number, since it uses less digits than its factorization.

685278086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342639045.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The square root of 685278086 is about 26177.8166774848. The cubic root of 685278086 is about 881.6352540118.

The spelling of 685278086 in words is "six hundred eighty-five million, two hundred seventy-eight thousand, eighty-six".