681443700 has 72 divisors (see below), whose sum is σ = 2253314112. Its totient is φ = 155758080.

The previous prime is 681443699. The next prime is 681443717. The reversal of 681443700 is 7344186.

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, 160149 + ... + 164348.

Almost surely, 2^681443700 is an apocalyptic number.

681443700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681443700 is an abundant number, since it is smaller than the sum of its proper divisors (1571870412).

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

681443700 is a wasteful number, since it uses less digits than its factorization.

681443700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324521 (or 324514 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 681443700 is about 26104.4766275825. The cubic root of 681443700 is about 879.9878183575.

Adding to 681443700 its reverse (7344186), we get a palindrome (688787886).

The spelling of 681443700 in words is "six hundred eighty-one million, four hundred forty-three thousand, seven hundred".