71247305 has 8 divisors (see below), whose sum is σ = 86281800. Its totient is φ = 56474496.

The previous prime is 71247277. The next prime is 71247349. The reversal of 71247305 is 50374217.

It can be written as a sum of positive squares in 4 ways, for example, as 14531344 + 56715961 = 3812^2 + 7531^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71247305 - 2²² = 67053001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64820 + ... + 65909.

It is an arithmetic number, because the mean of its divisors is an integer number (10785225).

Almost surely, 2^71247305 is an apocalyptic number.

It is an amenable number.

71247305 is a deficient number, since it is larger than the sum of its proper divisors (15034495).

71247305 is a wasteful number, since it uses less digits than its factorization.

71247305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130843.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 71247305 is about 8440.8118685349. The cubic root of 71247305 is about 414.5619900855.

The spelling of 71247305 in words is "seventy-one million, two hundred forty-seven thousand, three hundred five".