685878355 has 4 divisors (see below), whose sum is σ = 823054032. Its totient is φ = 548702680.

The previous prime is 685878343. The next prime is 685878371. The reversal of 685878355 is 553878586.

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

It is a de Polignac number, because none of the positive numbers 2^k-685878355 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685878296 and 685878305.

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, 68587831 + ... + 68587840.

It is an arithmetic number, because the mean of its divisors is an integer number (205763508).

Almost surely, 2^685878355 is an apocalyptic number.

685878355 is a deficient number, since it is larger than the sum of its proper divisors (137175677).

685878355 is a wasteful number, since it uses less digits than its factorization.

685878355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137175676.

The product of its digits is 8064000, while the sum is 55.

The square root of 685878355 is about 26189.2793906209. The cubic root of 685878355 is about 881.8926015400.

The spelling of 685878355 in words is "six hundred eighty-five million, eight hundred seventy-eight thousand, three hundred fifty-five".