82581285 has 16 divisors (see below), whose sum is σ = 135203904. Its totient is φ = 43018752.

The previous prime is 82581269. The next prime is 82581329. The reversal of 82581285 is 58218528.

It is not a de Polignac number, because 82581285 - 2⁴ = 82581269 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 15 ways as a sum of consecutive naturals, for example, 63372 + ... + 64661.

It is an arithmetic number, because the mean of its divisors is an integer number (8450244).

Almost surely, 2^82581285 is an apocalyptic number.

It is an amenable number.

82581285 is a deficient number, since it is larger than the sum of its proper divisors (52622619).

82581285 is a wasteful number, since it uses less digits than its factorization.

82581285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128084.

The product of its digits is 51200, while the sum is 39.

The square root of 82581285 is about 9087.4245526442. The cubic root of 82581285 is about 435.4723103520.

The spelling of 82581285 in words is "eighty-two million, five hundred eighty-one thousand, two hundred eighty-five".