681959320 has 32 divisors (see below), whose sum is σ = 1753610400. Its totient is φ = 233814528.

The previous prime is 681959287. The next prime is 681959339. The reversal of 681959320 is 23959186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217505 + ... + 1218064.

It is an arithmetic number, because the mean of its divisors is an integer number (54800325).

Almost surely, 2^681959320 is an apocalyptic number.

It is an amenable number.

681959320 is an abundant number, since it is smaller than the sum of its proper divisors (1071651080).

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

681959320 is a wasteful number, since it uses less digits than its factorization.

681959320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435587 (or 2435583 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 681959320 is about 26114.3508439325. The cubic root of 681959320 is about 880.2097124162.

The spelling of 681959320 in words is "six hundred eighty-one million, nine hundred fifty-nine thousand, three hundred twenty".