71028666 has 12 divisors (see below), whose sum is σ = 153895482. Its totient is φ = 23676216.

The previous prime is 71028611. The next prime is 71028689. The reversal of 71028666 is 66682017.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55935441 + 15093225 = 7479^2 + 3885^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71028666.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1973001 + ... + 1973036.

Almost surely, 2^71028666 is an apocalyptic number.

71028666 is an abundant number, since it is smaller than the sum of its proper divisors (82866816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71028666 is a wasteful number, since it uses less digits than its factorization.

71028666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946045 (or 3946042 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 71028666 is about 8427.8506156671. The cubic root of 71028666 is about 414.1374954635.

The spelling of 71028666 in words is "seventy-one million, twenty-eight thousand, six hundred sixty-six".