681808290 has 64 divisors (see below), whose sum is σ = 1738174464. Its totient is φ = 170569728.

The previous prime is 681808249. The next prime is 681808319. The reversal of 681808290 is 92808186.

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, 169887 + ... + 173853.

It is an arithmetic number, because the mean of its divisors is an integer number (27158976).

Almost surely, 2^681808290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681808290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (869087232).

681808290 is an abundant number, since it is smaller than the sum of its proper divisors (1056366174).

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

681808290 is a wasteful number, since it uses less digits than its factorization.

681808290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 681808290 is about 26111.4589787702. The cubic root of 681808290 is about 880.1447291228.

The spelling of 681808290 in words is "six hundred eighty-one million, eight hundred eight thousand, two hundred ninety".