78494105 has 4 divisors (see below), whose sum is σ = 94192932. Its totient is φ = 62795280.

The previous prime is 78494071. The next prime is 78494159. The reversal of 78494105 is 50149487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50149487 = 1867 ⋅26861.

It can be written as a sum of positive squares in 2 ways, for example, as 9803161 + 68690944 = 3131^2 + 8288^2 .

It is not a de Polignac number, because 78494105 - 2¹⁰ = 78493081 is a prime.

It is a super-2 number, since 2×78494105² = 12322649039502050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7849406 + ... + 7849415.

It is an arithmetic number, because the mean of its divisors is an integer number (23548233).

Almost surely, 2^78494105 is an apocalyptic number.

It is an amenable number.

78494105 is a deficient number, since it is larger than the sum of its proper divisors (15698827).

78494105 is a wasteful number, since it uses less digits than its factorization.

78494105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15698826.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 78494105 is about 8859.6898929929. The cubic root of 78494105 is about 428.1661672456.

The spelling of 78494105 in words is "seventy-eight million, four hundred ninety-four thousand, one hundred five".