8258128085 has 8 divisors (see below), whose sum is σ = 9911846616. Its totient is φ = 6605107200.

The previous prime is 8258128057. The next prime is 8258128111. The reversal of 8258128085 is 5808218528.

It can be written as a sum of positive squares in 4 ways, for example, as 1729811281 + 6528316804 = 41591^2 + 80798^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-8258128085 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148004 + ... + 196013.

It is an arithmetic number, because the mean of its divisors is an integer number (1238980827).

Almost surely, 2^8258128085 is an apocalyptic number.

It is an amenable number.

8258128085 is a deficient number, since it is larger than the sum of its proper divisors (1653718531).

8258128085 is a wasteful number, since it uses less digits than its factorization.

8258128085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348823.

The product of its (nonzero) digits is 409600, while the sum is 47.

The square root of 8258128085 is about 90874.2432430664. The cubic root of 8258128085 is about 2021.2833792185.

The spelling of 8258128085 in words is "eight billion, two hundred fifty-eight million, one hundred twenty-eight thousand, eighty-five".