681673320 has 224 divisors, whose sum is σ = 2332942920. Its totient is φ = 179159040.

The previous prime is 681673319. The next prime is 681673357. The reversal of 681673320 is 23376186.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 598389444 + 83283876 = 24462^2 + 9126^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2828400 + ... + 2828640.

Almost surely, 2^681673320 is an apocalyptic number.

681673320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681673320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166471460).

681673320 is an abundant number, since it is smaller than the sum of its proper divisors (1651269600).

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

681673320 is a wasteful number, since it uses less digits than its factorization.

681673320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 681673320 is about 26108.8743533688. The cubic root of 681673320 is about 880.0866478042.

The spelling of 681673320 in words is "six hundred eighty-one million, six hundred seventy-three thousand, three hundred twenty".