78001585 has 4 divisors (see below), whose sum is σ = 93601908. Its totient is φ = 62401264.

The previous prime is 78001543. The next prime is 78001597. The reversal of 78001585 is 58510087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35712576 + 42289009 = 5976^2 + 6503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78001585 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 78001585.

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 3 ways as a sum of consecutive naturals, for example, 7800154 + ... + 7800163.

It is an arithmetic number, because the mean of its divisors is an integer number (23400477).

Almost surely, 2^78001585 is an apocalyptic number.

It is an amenable number.

78001585 is a deficient number, since it is larger than the sum of its proper divisors (15600323).

78001585 is a wasteful number, since it uses less digits than its factorization.

78001585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15600322.

The product of its (nonzero) digits is 11200, while the sum is 34.

The square root of 78001585 is about 8831.8505988270. The cubic root of 78001585 is about 427.2687622374.

The spelling of 78001585 in words is "seventy-eight million, one thousand, five hundred eighty-five".