78661585 has 8 divisors (see below), whose sum is σ = 95276736. Its totient is φ = 62340720.

The previous prime is 78661571. The next prime is 78661607. The reversal of 78661585 is 58516687.

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

It is a de Polignac number, because none of the positive numbers 2^k-78661585 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72981 + ... + 74050.

It is an arithmetic number, because the mean of its divisors is an integer number (11909592).

Almost surely, 2^78661585 is an apocalyptic number.

It is an amenable number.

78661585 is a deficient number, since it is larger than the sum of its proper divisors (16615151).

78661585 is a wasteful number, since it uses less digits than its factorization.

78661585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147143.

The product of its digits is 403200, while the sum is 46.

The square root of 78661585 is about 8869.1366547145. The cubic root of 78661585 is about 428.4704717490.

The spelling of 78661585 in words is "seventy-eight million, six hundred sixty-one thousand, five hundred eighty-five".