71889993 has 24 divisors (see below), whose sum is σ = 119403648. Its totient is φ = 40828032.

The previous prime is 71889989. The next prime is 71890031. The reversal of 71889993 is 39998817.

It is not a de Polignac number, because 71889993 - 2² = 71889989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71889793) 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 23 ways as a sum of consecutive naturals, for example, 7105 + ... + 13937.

It is an arithmetic number, because the mean of its divisors is an integer number (4975152).

Almost surely, 2^71889993 is an apocalyptic number.

It is an amenable number.

71889993 is a deficient number, since it is larger than the sum of its proper divisors (47513655).

71889993 is a wasteful number, since it uses less digits than its factorization.

71889993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013 (or 7010 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 71889993 is about 8478.7966716982. The cubic root of 71889993 is about 415.8047827417.

The spelling of 71889993 in words is "seventy-one million, eight hundred eighty-nine thousand, nine hundred ninety-three".