681552 has 30 divisors (see below), whose sum is σ = 1907802. Its totient is φ = 227136.

The previous prime is 681539. The next prime is 681557. The reversal of 681552 is 255186.

It can be written as a sum of positive squares in only one way, i.e., 484416 + 197136 = 696^2 + 444^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2223 + ... + 2510.

2⁶⁸¹⁵⁵² is an apocalyptic number.

It is an amenable number.

681552 is an abundant number, since it is smaller than the sum of its proper divisors (1226250).

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

681552 is a wasteful number, since it uses less digits than its factorization.

681552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747 (or 4738 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 681552 is about 825.5616270152. The cubic root of 681552 is about 88.0034433914.

The spelling of 681552 in words is "six hundred eighty-one thousand, five hundred fifty-two".