685075138 has 48 divisors (see below), whose sum is σ = 1188649728. Its totient is φ = 295495200.

The previous prime is 685075117. The next prime is 685075141. The reversal of 685075138 is 831570586.

It is a junction number, because it is equal to n+sod(n) for n = 685075094 and 685075103.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 396745 + ... + 398467.

It is an arithmetic number, because the mean of its divisors is an integer number (24763536).

Almost surely, 2^685075138 is an apocalyptic number.

685075138 is a deficient number, since it is larger than the sum of its proper divisors (503574590).

685075138 is a wasteful number, since it uses less digits than its factorization.

685075138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 685075138 is about 26173.9400549478. The cubic root of 685075138 is about 881.5482120837.

The spelling of 685075138 in words is "six hundred eighty-five million, seventy-five thousand, one hundred thirty-eight".