78804585 has 12 divisors (see below), whose sum is σ = 136594692. Its totient is φ = 42029088.

The previous prime is 78804559. The next prime is 78804611. The reversal of 78804585 is 58540887.

It is an interprime number because it is at equal distance from previous prime (78804559) and next prime (78804611).

It can be written as a sum of positive squares in 2 ways, for example, as 41679936 + 37124649 = 6456^2 + 6093^2 .

It is not a de Polignac number, because 78804585 - 2⁵ = 78804553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1751213 = 78804585 / (7 + 8 + 8 + 0 + 4 + 5 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 78804585.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 875562 + ... + 875651.

It is an arithmetic number, because the mean of its divisors is an integer number (11382891).

Almost surely, 2^78804585 is an apocalyptic number.

It is an amenable number.

78804585 is a deficient number, since it is larger than the sum of its proper divisors (57790107).

78804585 is a wasteful number, since it uses less digits than its factorization.

78804585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751224 (or 1751221 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 78804585 is about 8877.1946582240. The cubic root of 78804585 is about 428.7299554020.

The spelling of 78804585 in words is "seventy-eight million, eight hundred four thousand, five hundred eighty-five".