681506364 has 144 divisors (see below), whose sum is σ = 2103315200. Its totient is φ = 167650560.

The previous prime is 681506341. The next prime is 681506369. The reversal of 681506364 is 463605186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681506369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191352 + ... + 194880.

Almost surely, 2^681506364 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 681506364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051657600).

681506364 is an abundant number, since it is smaller than the sum of its proper divisors (1421808836).

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

681506364 is a wasteful number, since it uses less digits than its factorization.

681506364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3571 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 681506364 is about 26105.6768538952. The cubic root of 681506364 is about 880.0147914180.

The spelling of 681506364 in words is "six hundred eighty-one million, five hundred six thousand, three hundred sixty-four".