78634911 has 16 divisors (see below), whose sum is σ = 111760128. Its totient is φ = 49008000.

The previous prime is 78634903. The next prime is 78634931. The reversal of 78634911 is 11943687.

It is not a de Polignac number, because 78634911 - 2³ = 78634903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78634911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78634931) 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, 2596 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (6985008).

Almost surely, 2^78634911 is an apocalyptic number.

78634911 is a deficient number, since it is larger than the sum of its proper divisors (33125217).

78634911 is a wasteful number, since it uses less digits than its factorization.

78634911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10382.

The product of its digits is 36288, while the sum is 39.

The square root of 78634911 is about 8867.6327731814. The cubic root of 78634911 is about 428.4220350885.

The spelling of 78634911 in words is "seventy-eight million, six hundred thirty-four thousand, nine hundred eleven".