681306552 has 160 divisors (see below), whose sum is σ = 2109175200. Its totient is φ = 204374016.

The previous prime is 681306539. The next prime is 681306611. The reversal of 681306552 is 255603186.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 252024 + ... + 254712.

It is an arithmetic number, because the mean of its divisors is an integer number (13182345).

Almost surely, 2^681306552 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 681306552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054587600).

681306552 is an abundant number, since it is smaller than the sum of its proper divisors (1427868648).

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

681306552 is a wasteful number, since it uses less digits than its factorization.

681306552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747 (or 2734 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 681306552 is about 26101.8495896364. The cubic root of 681306552 is about 879.9287786712.

The spelling of 681306552 in words is "six hundred eighty-one million, three hundred six thousand, five hundred fifty-two".