7689281985 has 144 divisors (see below), whose sum is σ = 17729083008. Its totient is φ = 3007319040.

The previous prime is 7689281953. The next prime is 7689281989. The reversal of 7689281985 is 5891829867.

It is a happy number.

It is not a de Polignac number, because 7689281985 - 2⁵ = 7689281953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (7689281989) 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 143 ways as a sum of consecutive naturals, for example, 642022 + ... + 653888.

It is an arithmetic number, because the mean of its divisors is an integer number (123118632).

Almost surely, 2^7689281985 is an apocalyptic number.

It is an amenable number.

7689281985 is an abundant number, since it is smaller than the sum of its proper divisors (10039801023).

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

7689281985 is a wasteful number, since it uses less digits than its factorization.

7689281985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11924 (or 11910 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The square root of 7689281985 is about 87688.5510485833. The cubic root of 7689281985 is about 1973.7641777828.

The spelling of 7689281985 in words is "seven billion, six hundred eighty-nine million, two hundred eighty-one thousand, nine hundred eighty-five".