7891481858 has 16 divisors (see below), whose sum is σ = 12800683896. Its totient is φ = 3627106560.

The previous prime is 7891481797. The next prime is 7891481879. The reversal of 7891481858 is 8581841987.

It can be written as a sum of positive squares in 4 ways, for example, as 7836321529 + 55160329 = 88523^2 + 7427^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7891481797 and 7891481806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623441 + ... + 635972.

Almost surely, 2^7891481858 is an apocalyptic number.

7891481858 is a deficient number, since it is larger than the sum of its proper divisors (4909202038).

7891481858 is a wasteful number, since it uses less digits than its factorization.

7891481858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259669.

The product of its digits is 5160960, while the sum is 59.

The square root of 7891481858 is about 88834.0129567498. The cubic root of 7891481858 is about 1990.9156210039.

The spelling of 7891481858 in words is "seven billion, eight hundred ninety-one million, four hundred eighty-one thousand, eight hundred fifty-eight".