71228311 has 24 divisors (see below), whose sum is σ = 91338624. Its totient is φ = 54920880.

The previous prime is 71228299. The next prime is 71228327. The reversal of 71228311 is 11382217.

It is a happy number.

It is not a de Polignac number, because 71228311 - 2¹³ = 71220119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71228371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54876 + ... + 56158.

It is an arithmetic number, because the mean of its divisors is an integer number (3805776).

Almost surely, 2^71228311 is an apocalyptic number.

71228311 is a deficient number, since it is larger than the sum of its proper divisors (20110313).

71228311 is a wasteful number, since it uses less digits than its factorization.

71228311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411 (or 1404 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 71228311 is about 8439.6866647998. The cubic root of 71228311 is about 414.5251471000.

The spelling of 71228311 in words is "seventy-one million, two hundred twenty-eight thousand, three hundred eleven".