681763700 has 72 divisors (see below), whose sum is σ = 1625104320. Its totient is φ = 247104000.

The previous prime is 681763673. The next prime is 681763729. The reversal of 681763700 is 7367186.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35900 + ... + 51500.

Almost surely, 2^681763700 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 681763700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812552160).

681763700 is an abundant number, since it is smaller than the sum of its proper divisors (943340620).

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

681763700 is a wasteful number, since it uses less digits than its factorization.

681763700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15657 (or 15650 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 681763700 is about 26110.6051251211. The cubic root of 681763700 is about 880.1255416623.

The spelling of 681763700 in words is "six hundred eighty-one million, seven hundred sixty-three thousand, seven hundred".