78115105 has 4 divisors (see below), whose sum is σ = 93738132. Its totient is φ = 62492080.

The previous prime is 78115091. The next prime is 78115111. The reversal of 78115105 is 50151187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50151187 = 1283 ⋅39089.

It can be written as a sum of positive squares in 2 ways, for example, as 34012224 + 44102881 = 5832^2 + 6641^2 .

It is not a de Polignac number, because 78115105 - 2⁵ = 78115073 is a prime.

It is a super-2 number, since 2×78115105² = 12203939258322050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7811506 + ... + 7811515.

It is an arithmetic number, because the mean of its divisors is an integer number (23434533).

Almost surely, 2^78115105 is an apocalyptic number.

It is an amenable number.

78115105 is a deficient number, since it is larger than the sum of its proper divisors (15623027).

78115105 is a wasteful number, since it uses less digits than its factorization.

78115105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15623026.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 78115105 is about 8838.2750013789. The cubic root of 78115105 is about 427.4759376810.

The spelling of 78115105 in words is "seventy-eight million, one hundred fifteen thousand, one hundred five".