71286928 has 20 divisors (see below), whose sum is σ = 140182000. Its totient is φ = 35110944.

The previous prime is 71286923. The next prime is 71286937. The reversal of 71286928 is 82968217.

It is a super-2 number, since 2×71286928² = 10163652207354368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71286923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32178 + ... + 34321.

It is an arithmetic number, because the mean of its divisors is an integer number (7009100).

Almost surely, 2^71286928 is an apocalyptic number.

It is an amenable number.

71286928 is a deficient number, since it is larger than the sum of its proper divisors (68895072).

71286928 is a wasteful number, since it uses less digits than its factorization.

71286928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66574 (or 66568 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 71286928 is about 8443.1586506473. The cubic root of 71286928 is about 414.6388264216.

The spelling of 71286928 in words is "seventy-one million, two hundred eighty-six thousand, nine hundred twenty-eight".