681732563 has 8 divisors (see below), whose sum is σ = 704040960. Its totient is φ = 659444040.

The previous prime is 681732553. The next prime is 681732593. The reversal of 681732563 is 365237186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681732563 - 2⁴ = 681732547 is a prime.

It is a super-3 number, since 3×681732563³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681732563.

It is not an unprimeable number, because it can be changed into a prime (681732553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100856 + ... + 107402.

It is an arithmetic number, because the mean of its divisors is an integer number (88005120).

Almost surely, 2^681732563 is an apocalyptic number.

681732563 is a deficient number, since it is larger than the sum of its proper divisors (22308397).

681732563 is a wasteful number, since it uses less digits than its factorization.

681732563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9937.

The product of its digits is 181440, while the sum is 41.

The square root of 681732563 is about 26110.0088663332. The cubic root of 681732563 is about 880.1121426472.

The spelling of 681732563 in words is "six hundred eighty-one million, seven hundred thirty-two thousand, five hundred sixty-three".