681136512 has 256 divisors, whose sum is σ = 2171473920. Its totient is φ = 185149440.

The previous prime is 681136507. The next prime is 681136523. The reversal of 681136512 is 215631186.

It is a super-2 number, since 2×681136512² = 927893895959052288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8206423 + ... + 8206505.

It is an arithmetic number, because the mean of its divisors is an integer number (8482320).

Almost surely, 2^681136512 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 681136512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085736960).

681136512 is an abundant number, since it is smaller than the sum of its proper divisors (1490337408).

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

681136512 is a wasteful number, since it uses less digits than its factorization.

681136512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 209 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 681136512 is about 26098.5921459377. The cubic root of 681136512 is about 879.8555685828.

Adding to 681136512 its reverse (215631186), we get a palindrome (896767698).

The spelling of 681136512 in words is "six hundred eighty-one million, one hundred thirty-six thousand, five hundred twelve".