681820700 has 216 divisors, whose sum is σ = 1821539664. Its totient is φ = 218880000.

The previous prime is 681820691. The next prime is 681820721. The reversal of 681820700 is 7028186.

681820700 = 485² + 486² + ... + 1292².

It is a super-3 number, since 3×681820700³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6750650 + ... + 6750750.

It is an arithmetic number, because the mean of its divisors is an integer number (8433054).

Almost surely, 2^681820700 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 681820700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910769832).

681820700 is an abundant number, since it is smaller than the sum of its proper divisors (1139718964).

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

681820700 is a wasteful number, since it uses less digits than its factorization.

681820700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 681820700 is about 26111.6966128209. The cubic root of 681820700 is about 880.1500691038.

Adding to 681820700 its reverse (7028186), we get a palindrome (688848886).

The spelling of 681820700 in words is "six hundred eighty-one million, eight hundred twenty thousand, seven hundred".