684673857 has 32 divisors (see below), whose sum is σ = 1170524160. Its totient is φ = 387432720.

The previous prime is 684673841. The next prime is 684673859. The reversal of 684673857 is 758376486.

It is not a de Polignac number, because 684673857 - 2⁴ = 684673841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684673859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1882 + ... + 37052.

It is an arithmetic number, because the mean of its divisors is an integer number (36578880).

Almost surely, 2^684673857 is an apocalyptic number.

It is an amenable number.

684673857 is a deficient number, since it is larger than the sum of its proper divisors (485850303).

684673857 is a wasteful number, since it uses less digits than its factorization.

684673857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35290 (or 35284 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The square root of 684673857 is about 26166.2732730513. The cubic root of 684673857 is about 881.3760569336.

It can be divided in two parts, 684 and 673857, that added together give a triangular number (674541 = T₁₁₆₁).

The spelling of 684673857 in words is "six hundred eighty-four million, six hundred seventy-three thousand, eight hundred fifty-seven".