78789117 has 16 divisors (see below), whose sum is σ = 114780672. Its totient is φ = 47676720.

The previous prime is 78789107. The next prime is 78789121. The reversal of 78789117 is 71198787.

It is a de Polignac number, because none of the positive numbers 2^k-78789117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78789107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25848 + ... + 28734.

It is an arithmetic number, because the mean of its divisors is an integer number (7173792).

Almost surely, 2^78789117 is an apocalyptic number.

It is an amenable number.

78789117 is a deficient number, since it is larger than the sum of its proper divisors (35991555).

78789117 is a wasteful number, since it uses less digits than its factorization.

78789117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728.

The product of its digits is 197568, while the sum is 48.

The square root of 78789117 is about 8876.3233942889. The cubic root of 78789117 is about 428.7019027665.

The spelling of 78789117 in words is "seventy-eight million, seven hundred eighty-nine thousand, one hundred seventeen".