681900238 has 8 divisors (see below), whose sum is σ = 1030316832. Its totient is φ = 338461296.

The previous prime is 681900217. The next prime is 681900257. The reversal of 681900238 is 832009186.

681900238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 681900197 and 681900206.

It is a congruent number.

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, 1244070 + ... + 1244617.

It is an arithmetic number, because the mean of its divisors is an integer number (128789604).

Almost surely, 2^681900238 is an apocalyptic number.

681900238 is a deficient number, since it is larger than the sum of its proper divisors (348416594).

681900238 is a wasteful number, since it uses less digits than its factorization.

681900238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488826.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 681900238 is about 26113.2196023393. The cubic root of 681900238 is about 880.1842924972.

The spelling of 681900238 in words is "six hundred eighty-one million, nine hundred thousand, two hundred thirty-eight".