80705305 has 4 divisors (see below), whose sum is σ = 96846372. Its totient is φ = 64564240.

The previous prime is 80705291. The next prime is 80705309. The reversal of 80705305 is 50350708.

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 59397849 + 21307456 = 7707^2 + 4616^2 .

It is a de Polignac number, because none of the positive numbers 2^k-80705305 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80705309) 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, 8070526 + ... + 8070535.

It is an arithmetic number, because the mean of its divisors is an integer number (24211593).

Almost surely, 2^80705305 is an apocalyptic number.

It is an amenable number.

80705305 is a deficient number, since it is larger than the sum of its proper divisors (16141067).

80705305 is a wasteful number, since it uses less digits than its factorization.

80705305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16141066.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 80705305 is about 8983.6131372628. The cubic root of 80705305 is about 432.1495127918.

The spelling of 80705305 in words is "eighty million, seven hundred five thousand, three hundred five".