8157285 has 12 divisors (see below), whose sum is σ = 14139372. Its totient is φ = 4350528.

The previous prime is 8157271. The next prime is 8157293. The reversal of 8157285 is 5827518.

8157285 is a `hidden beast` number, since 8 + 1 + 572 + 85 = 666.

8157285 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 2 ways, for example, as 2090916 + 6066369 = 1446^2 + 2463^2 .

It is not a de Polignac number, because 8157285 - 2⁶ = 8157221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90592 + ... + 90681.

It is an arithmetic number, because the mean of its divisors is an integer number (1178281).

Almost surely, 2^8157285 is an apocalyptic number.

It is an amenable number.

8157285 is a deficient number, since it is larger than the sum of its proper divisors (5982087).

8157285 is a wasteful number, since it uses less digits than its factorization.

8157285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181284 (or 181281 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 8157285 is about 2856.0961118282. The cubic root of 8157285 is about 201.3022111619.

It can be divided in two parts, 815 and 7285, that added together give a square (8100 = 90²).

The spelling of 8157285 in words is "eight million, one hundred fifty-seven thousand, two hundred eighty-five".