78084117 has 6 divisors (see below), whose sum is σ = 112788182. Its totient is φ = 52056072.

The previous prime is 78084113. The next prime is 78084151. The reversal of 78084117 is 71148087.

It can be written as a sum of positive squares in only one way, i.e., 74545956 + 3538161 = 8634^2 + 1881^2 .

It is not a de Polignac number, because 78084117 - 2² = 78084113 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 (78084113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4337998 + ... + 4338015.

Almost surely, 2^78084117 is an apocalyptic number.

It is an amenable number.

78084117 is a deficient number, since it is larger than the sum of its proper divisors (34704065).

78084117 is a wasteful number, since it uses less digits than its factorization.

78084117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8676019 (or 8676016 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 78084117 is about 8836.5217704706. The cubic root of 78084117 is about 427.4194041148.

The spelling of 78084117 in words is "seventy-eight million, eighty-four thousand, one hundred seventeen".