78585865 has 8 divisors (see below), whose sum is σ = 94640328. Its totient is φ = 62643840.

The previous prime is 78585863. The next prime is 78585931. The reversal of 78585865 is 56858587.

It can be written as a sum of positive squares in 4 ways, for example, as 5089536 + 73496329 = 2256^2 + 8573^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78585865 - 2¹ = 78585863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78585863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26562 + ... + 29371.

It is an arithmetic number, because the mean of its divisors is an integer number (11830041).

Almost surely, 2^78585865 is an apocalyptic number.

It is an amenable number.

78585865 is a deficient number, since it is larger than the sum of its proper divisors (16054463).

78585865 is a wasteful number, since it uses less digits than its factorization.

78585865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56219.

The product of its digits is 2688000, while the sum is 52.

The square root of 78585865 is about 8864.8668912737. The cubic root of 78585865 is about 428.3329450690.

The spelling of 78585865 in words is "seventy-eight million, five hundred eighty-five thousand, eight hundred sixty-five".