78671615 has 16 divisors (see below), whose sum is σ = 107467776. Its totient is φ = 54727200.

The previous prime is 78671591. The next prime is 78671623. The reversal of 78671615 is 51617687.

It is a de Polignac number, because none of the positive numbers 2^k-78671615 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29831 + ... + 32360.

It is an arithmetic number, because the mean of its divisors is an integer number (6716736).

Almost surely, 2^78671615 is an apocalyptic number.

78671615 is a deficient number, since it is larger than the sum of its proper divisors (28796161).

78671615 is a wasteful number, since it uses less digits than its factorization.

78671615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62230.

The product of its digits is 70560, while the sum is 41.

The square root of 78671615 is about 8869.7020806789. The cubic root of 78671615 is about 428.4886821465.

The spelling of 78671615 in words is "seventy-eight million, six hundred seventy-one thousand, six hundred fifteen".