78584887 has 4 divisors (see below), whose sum is σ = 78623896. Its totient is φ = 78545880.

The previous prime is 78584843. The next prime is 78584899. The reversal of 78584887 is 78848587.

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

It is a cyclic number.

It is not a de Polignac number, because 78584887 - 2¹⁵ = 78552119 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 (78584087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16308 + ... + 20569.

It is an arithmetic number, because the mean of its divisors is an integer number (19655974).

Almost surely, 2^78584887 is an apocalyptic number.

78584887 is a deficient number, since it is larger than the sum of its proper divisors (39009).

78584887 is a wasteful number, since it uses less digits than its factorization.

78584887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39008.

The product of its digits is 4014080, while the sum is 55.

The square root of 78584887 is about 8864.8117295293. The cubic root of 78584887 is about 428.3311681958.

The spelling of 78584887 in words is "seventy-eight million, five hundred eighty-four thousand, eight hundred eighty-seven".