78605871 has 8 divisors (see below), whose sum is σ = 107640624. Its totient is φ = 50987520.

The previous prime is 78605861. The next prime is 78605887. The reversal of 78605871 is 17850687.

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-78605871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78605861) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 353970 + ... + 354191.

It is an arithmetic number, because the mean of its divisors is an integer number (13455078).

Almost surely, 2^78605871 is an apocalyptic number.

78605871 is a deficient number, since it is larger than the sum of its proper divisors (29034753).

78605871 is a wasteful number, since it uses less digits than its factorization.

78605871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708201.

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 78605871 is about 8865.9952064052. The cubic root of 78605871 is about 428.3692896111.

It can be divided in two parts, 7860 and 5871, that added together give a palindrome (13731).

The spelling of 78605871 in words is "seventy-eight million, six hundred five thousand, eight hundred seventy-one".