71133428 has 12 divisors (see below), whose sum is σ = 125882820. Its totient is φ = 35166912.

The previous prime is 71133427. The next prime is 71133443. The reversal of 71133428 is 82433117.

It can be written as a sum of positive squares in 2 ways, for example, as 50865424 + 20268004 = 7132^2 + 4502^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71133428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71133427) 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, 99551 + ... + 100262.

It is an arithmetic number, because the mean of its divisors is an integer number (10490235).

Almost surely, 2^71133428 is an apocalyptic number.

It is an amenable number.

71133428 is a deficient number, since it is larger than the sum of its proper divisors (54749392).

71133428 is a wasteful number, since it uses less digits than its factorization.

71133428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199906 (or 199904 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 71133428 is about 8434.0635520489. The cubic root of 71133428 is about 414.3410027791.

The spelling of 71133428 in words is "seventy-one million, one hundred thirty-three thousand, four hundred twenty-eight".