7898358681 has 20 divisors (see below), whose sum is σ = 11809370100. Its totient is φ = 5260847616.

The previous prime is 7898358673. The next prime is 7898358683. The reversal of 7898358681 is 1868538987.

It can be written as a sum of positive squares in 2 ways, for example, as 1483790400 + 6414568281 = 38520^2 + 80091^2 .

It is not a de Polignac number, because 7898358681 - 2³ = 7898358673 is a prime.

It is a super-2 number, since 2×7898358681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7898358683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48265 + ... + 134633.

It is an arithmetic number, because the mean of its divisors is an integer number (590468505).

Almost surely, 2^7898358681 is an apocalyptic number.

It is an amenable number.

7898358681 is a deficient number, since it is larger than the sum of its proper divisors (3911011419).

7898358681 is a wasteful number, since it uses less digits than its factorization.

7898358681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87510 (or 87501 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The square root of 7898358681 is about 88872.7105527901. The cubic root of 7898358681 is about 1991.4937633421.

The spelling of 7898358681 in words is "seven billion, eight hundred ninety-eight million, three hundred fifty-eight thousand, six hundred eighty-one".