8205078257 has 16 divisors (see below), whose sum is σ = 8655336000. Its totient is φ = 7766708544.

The previous prime is 8205078247. The next prime is 8205078263. The reversal of 8205078257 is 7528705028.

It is not a de Polignac number, because 8205078257 - 2²² = 8200883953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8205078247) 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 15 ways as a sum of consecutive naturals, for example, 642143 + ... + 654795.

It is an arithmetic number, because the mean of its divisors is an integer number (540958500).

Almost surely, 2^8205078257 is an apocalyptic number.

It is an amenable number.

8205078257 is a deficient number, since it is larger than the sum of its proper divisors (450257743).

8205078257 is a wasteful number, since it uses less digits than its factorization.

8205078257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13120.

The product of its (nonzero) digits is 313600, while the sum is 44.

The square root of 8205078257 is about 90581.8870249456. The cubic root of 8205078257 is about 2016.9458680106.

The spelling of 8205078257 in words is "eight billion, two hundred five million, seventy-eight thousand, two hundred fifty-seven".