81460285 has 4 divisors (see below), whose sum is σ = 97752348. Its totient is φ = 65168224.

The previous prime is 81460279. The next prime is 81460289. The reversal of 81460285 is 58206418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58206418 = 2 ⋅29103209.

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 66552964 = 3861^2 + 8158^2 .

It is a cyclic number.

It is not a de Polignac number, because 81460285 - 2⁹ = 81459773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81460285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81460289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8146024 + ... + 8146033.

It is an arithmetic number, because the mean of its divisors is an integer number (24438087).

Almost surely, 2^81460285 is an apocalyptic number.

It is an amenable number.

81460285 is a deficient number, since it is larger than the sum of its proper divisors (16292063).

81460285 is a wasteful number, since it uses less digits than its factorization.

81460285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16292062.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 81460285 is about 9025.5351641883. The cubic root of 81460285 is about 433.4928863474.

The spelling of 81460285 in words is "eighty-one million, four hundred sixty thousand, two hundred eighty-five".