71520305 has 4 divisors (see below), whose sum is σ = 85824372. Its totient is φ = 57216240.

The previous prime is 71520301. The next prime is 71520329. The reversal of 71520305 is 50302517.

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 55830784 + 15689521 = 7472^2 + 3961^2 .

It is not a de Polignac number, because 71520305 - 2² = 71520301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71520301) 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, 7152026 + ... + 7152035.

It is an arithmetic number, because the mean of its divisors is an integer number (21456093).

Almost surely, 2^71520305 is an apocalyptic number.

It is an amenable number.

71520305 is a deficient number, since it is larger than the sum of its proper divisors (14304067).

71520305 is a wasteful number, since it uses less digits than its factorization.

71520305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14304066.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 71520305 is about 8456.9678372334. The cubic root of 71520305 is about 415.0908109202.

The spelling of 71520305 in words is "seventy-one million, five hundred twenty thousand, three hundred five".