7989315685 has 16 divisors (see below), whose sum is σ = 10376553600. Its totient is φ = 5870145600.

The previous prime is 7989315667. The next prime is 7989315689. The reversal of 7989315685 is 5865139897.

It is not a de Polignac number, because 7989315685 - 2²³ = 7980927077 is a prime.

It is a super-2 number, since 2×7989315685² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7989315689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295891 + ... + 321760.

It is an arithmetic number, because the mean of its divisors is an integer number (648534600).

Almost surely, 2^7989315685 is an apocalyptic number.

It is an amenable number.

7989315685 is a deficient number, since it is larger than the sum of its proper divisors (2387237915).

7989315685 is a wasteful number, since it uses less digits than its factorization.

7989315685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617868.

The product of its digits is 16329600, while the sum is 61.

The square root of 7989315685 is about 89382.9720080956. The cubic root of 7989315685 is about 1999.1092437522.

The spelling of 7989315685 in words is "seven billion, nine hundred eighty-nine million, three hundred fifteen thousand, six hundred eighty-five".