681500736 has 224 divisors, whose sum is σ = 2316154880. Its totient is φ = 192471552.

The previous prime is 681500719. The next prime is 681500761. The reversal of 681500736 is 637005186.

681500736 is a `hidden beast` number, since 6 + 81 + 500 + 73 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (224).

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

It is a self number, because there is not a number n which added to its sum of digits gives 681500736.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1245615 + ... + 1246161.

Almost surely, 2^681500736 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 681500736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158077440).

681500736 is an abundant number, since it is smaller than the sum of its proper divisors (1634654144).

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

681500736 is a wasteful number, since it uses less digits than its factorization.

681500736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 681500736 is about 26105.5690610260. The cubic root of 681500736 is about 880.0123689722.

The spelling of 681500736 in words is "six hundred eighty-one million, five hundred thousand, seven hundred thirty-six".