681934338 has 12 divisors (see below), whose sum is σ = 1477524438. Its totient is φ = 227311440.

The previous prime is 681934303. The next prime is 681934387. The reversal of 681934338 is 833439186.

It can be written as a sum of positive squares in only one way, i.e., 602064369 + 79869969 = 24537^2 + 8937^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681934293 and 681934302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18942603 + ... + 18942638.

Almost surely, 2^681934338 is an apocalyptic number.

681934338 is an abundant number, since it is smaller than the sum of its proper divisors (795590100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681934338 is a wasteful number, since it uses less digits than its factorization.

681934338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37885249 (or 37885246 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 681934338 is about 26113.8725201759. The cubic root of 681934338 is about 880.1989641370.

The spelling of 681934338 in words is "six hundred eighty-one million, nine hundred thirty-four thousand, three hundred thirty-eight".