681958280 has 64 divisors (see below), whose sum is σ = 1612051200. Its totient is φ = 259142400.

The previous prime is 681958219. The next prime is 681958301. The reversal of 681958280 is 82859186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136466 + ... + 141374.

It is an arithmetic number, because the mean of its divisors is an integer number (25188300).

Almost surely, 2^681958280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681958280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806025600).

681958280 is an abundant number, since it is smaller than the sum of its proper divisors (930092920).

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

681958280 is a wasteful number, since it uses less digits than its factorization.

681958280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094 (or 5090 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 681958280 is about 26114.3309315020. The cubic root of 681958280 is about 880.2092649709.

It can be divided in two parts, 68 and 1958280, that multiplied together give a triangular number (133163040 = T₁₆₃₁₉).

The spelling of 681958280 in words is "six hundred eighty-one million, nine hundred fifty-eight thousand, two hundred eighty".