78457285 has 12 divisors (see below), whose sum is σ = 95740164. Its totient is φ = 61722240.

The previous prime is 78457283. The next prime is 78457321. The reversal of 78457285 is 58275487.

It can be written as a sum of positive squares in 6 ways, for example, as 15000129 + 63457156 = 3873^2 + 7966^2 .

It is not a de Polignac number, because 78457285 - 2¹ = 78457283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78457283) by changing a digit.

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, 16497 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (7978347).

Almost surely, 2^78457285 is an apocalyptic number.

It is an amenable number.

78457285 is a deficient number, since it is larger than the sum of its proper divisors (17282879).

78457285 is an equidigital number, since it uses as much as digits as its factorization.

78457285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344 (or 4283 counting only the distinct ones).

The product of its digits is 627200, while the sum is 46.

The square root of 78457285 is about 8857.6116984207. The cubic root of 78457285 is about 428.0992087399.

The spelling of 78457285 in words is "seventy-eight million, four hundred fifty-seven thousand, two hundred eighty-five".