78008305 has 4 divisors (see below), whose sum is σ = 93609972. Its totient is φ = 62406640.

The previous prime is 78008303. The next prime is 78008327. The reversal of 78008305 is 50380087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11553201 + 66455104 = 3399^2 + 8152^2 .

It is not a de Polignac number, because 78008305 - 2¹ = 78008303 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78008303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7800826 + ... + 7800835.

It is an arithmetic number, because the mean of its divisors is an integer number (23402493).

Almost surely, 2^78008305 is an apocalyptic number.

It is an amenable number.

78008305 is a deficient number, since it is larger than the sum of its proper divisors (15601667).

78008305 is a wasteful number, since it uses less digits than its factorization.

78008305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15601666.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 78008305 is about 8832.2310318515. The cubic root of 78008305 is about 427.2810319181.

The spelling of 78008305 in words is "seventy-eight million, eight thousand, three hundred five".