7812965889 has 24 divisors (see below), whose sum is σ = 12319347040. Its totient is φ = 4934501856.

The previous prime is 7812965821. The next prime is 7812965981. The reversal of 7812965889 is 9885692187.

It is a happy number.

It is not a de Polignac number, because 7812965889 - 2¹¹ = 7812963841 is a prime.

It is a super-2 number, since 2×7812965889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7812965819) 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 23 ways as a sum of consecutive naturals, for example, 841492 + ... + 850725.

Almost surely, 2^7812965889 is an apocalyptic number.

It is an amenable number.

7812965889 is a deficient number, since it is larger than the sum of its proper divisors (4506381151).

7812965889 is a wasteful number, since it uses less digits than its factorization.

7812965889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692251 (or 1692239 counting only the distinct ones).

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

The square root of 7812965889 is about 88390.9830751983. The cubic root of 7812965889 is about 1984.2907569863.

The spelling of 7812965889 in words is "seven billion, eight hundred twelve million, nine hundred sixty-five thousand, eight hundred eighty-nine".