82145985 has 16 divisors (see below), whose sum is σ = 131863680. Its totient is φ = 43667840.

The previous prime is 82145929. The next prime is 82146037. The reversal of 82145985 is 58954128.

It is a happy number.

It is not a de Polignac number, because 82145985 - 2¹¹ = 82143937 is a prime.

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, 4140 + ... + 13469.

It is an arithmetic number, because the mean of its divisors is an integer number (8241480).

Almost surely, 2^82145985 is an apocalyptic number.

It is an amenable number.

82145985 is a deficient number, since it is larger than the sum of its proper divisors (49717695).

82145985 is a wasteful number, since it uses less digits than its factorization.

82145985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17928.

The product of its digits is 115200, while the sum is 42.

The square root of 82145985 is about 9063.4422268805. The cubic root of 82145985 is about 434.7058124499.

The spelling of 82145985 in words is "eighty-two million, one hundred forty-five thousand, nine hundred eighty-five".