681432556 has 24 divisors (see below), whose sum is σ = 1443034656. Its totient is φ = 274863360.

The previous prime is 681432553. The next prime is 681432559. The reversal of 681432556 is 655234186.

It is an interprime number because it is at equal distance from previous prime (681432553) and next prime (681432559).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681432553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715315 + ... + 716266.

It is an arithmetic number, because the mean of its divisors is an integer number (60126444).

Almost surely, 2^681432556 is an apocalyptic number.

It is an amenable number.

681432556 is an abundant number, since it is smaller than the sum of its proper divisors (761602100).

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

681432556 is a wasteful number, since it uses less digits than its factorization.

681432556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431609 (or 1431607 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 681432556 is about 26104.2631767303. The cubic root of 681432556 is about 879.9830213666.

The spelling of 681432556 in words is "six hundred eighty-one million, four hundred thirty-two thousand, five hundred fifty-six".