681447700 has 72 divisors (see below), whose sum is σ = 1508873912. Its totient is φ = 267079680.

The previous prime is 681447671. The next prime is 681447709. The reversal of 681447700 is 7744186.

It can be written as a sum of positive squares in 12 ways, for example, as 349989264 + 331458436 = 18708^2 + 18206^2 .

It is a super-3 number, since 3×681447700³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681447700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681447709) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2021932 + ... + 2022268.

Almost surely, 2^681447700 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 681447700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754436956).

681447700 is an abundant number, since it is smaller than the sum of its proper divisors (827426212).

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

681447700 is a wasteful number, since it uses less digits than its factorization.

681447700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 681447700 is about 26104.5532426816. The cubic root of 681447700 is about 879.9895401649.

The spelling of 681447700 in words is "six hundred eighty-one million, four hundred forty-seven thousand, seven hundred".