681888963 has 8 divisors (see below), whose sum is σ = 1039068928. Its totient is φ = 389650824.

The previous prime is 681888953. The next prime is 681888973. The reversal of 681888963 is 369888186.

It is an interprime number because it is at equal distance from previous prime (681888953) and next prime (681888973).

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

It is not a de Polignac number, because 681888963 - 2⁸ = 681888707 is a prime.

It is a super-2 number, since 2×681888963² = 929945115722430738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681888913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16235431 + ... + 16235472.

It is an arithmetic number, because the mean of its divisors is an integer number (129883616).

Almost surely, 2^681888963 is an apocalyptic number.

681888963 is a deficient number, since it is larger than the sum of its proper divisors (357179965).

681888963 is a wasteful number, since it uses less digits than its factorization.

681888963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32470913.

The product of its digits is 3981312, while the sum is 57.

The square root of 681888963 is about 26113.0037146246. The cubic root of 681888963 is about 880.1794412829.

The spelling of 681888963 in words is "six hundred eighty-one million, eight hundred eighty-eight thousand, nine hundred sixty-three".