681322320 has 160 divisors (see below), whose sum is σ = 2682090240. Its totient is φ = 155727360.

The previous prime is 681322283. The next prime is 681322331. The reversal of 681322320 is 23223186.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7411 + ... + 37650.

It is an arithmetic number, because the mean of its divisors is an integer number (16763064).

Almost surely, 2^681322320 is an apocalyptic number.

681322320 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 681322320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341045120).

681322320 is an abundant number, since it is smaller than the sum of its proper divisors (2000767920).

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

681322320 is a wasteful number, since it uses less digits than its factorization.

681322320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45090 (or 45078 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 681322320 is about 26102.1516354495. The cubic root of 681322320 is about 879.9355669077.

The spelling of 681322320 in words is "six hundred eighty-one million, three hundred twenty-two thousand, three hundred twenty".