71128465 has 4 divisors (see below), whose sum is σ = 85354164. Its totient is φ = 56902768.

The previous prime is 71128433. The next prime is 71128469. The reversal of 71128465 is 56482117.

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 33281361 + 37847104 = 5769^2 + 6152^2 .

It is a cyclic number.

It is not a de Polignac number, because 71128465 - 2⁵ = 71128433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71128465.

It is not an unprimeable number, because it can be changed into a prime (71128469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7112842 + ... + 7112851.

It is an arithmetic number, because the mean of its divisors is an integer number (21338541).

Almost surely, 2^71128465 is an apocalyptic number.

It is an amenable number.

71128465 is a deficient number, since it is larger than the sum of its proper divisors (14225699).

71128465 is a wasteful number, since it uses less digits than its factorization.

71128465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14225698.

The product of its digits is 13440, while the sum is 34.

The square root of 71128465 is about 8433.7693233809. The cubic root of 71128465 is about 414.3313663242.

The spelling of 71128465 in words is "seventy-one million, one hundred twenty-eight thousand, four hundred sixty-five".