78516117 has 6 divisors (see below), whose sum is σ = 113412182. Its totient is φ = 52344072.

The previous prime is 78516103. The next prime is 78516133. The reversal of 78516117 is 71161587.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78163281 + 352836 = 8841^2 + 594^2 .

It is not a de Polignac number, because 78516117 - 2¹¹ = 78514069 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 (78516167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4361998 + ... + 4362015.

Almost surely, 2^78516117 is an apocalyptic number.

It is an amenable number.

78516117 is a deficient number, since it is larger than the sum of its proper divisors (34896065).

78516117 is a wasteful number, since it uses less digits than its factorization.

78516117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8724019 (or 8724016 counting only the distinct ones).

The product of its digits is 11760, while the sum is 36.

The square root of 78516117 is about 8860.9320615836. The cubic root of 78516117 is about 428.2061868659.

The spelling of 78516117 in words is "seventy-eight million, five hundred sixteen thousand, one hundred seventeen".