71387009 has 32 divisors (see below), whose sum is σ = 83635200. Its totient is φ = 60540480.

The previous prime is 71386999. The next prime is 71387011. The reversal of 71387009 is 90078317.

It is a cyclic number.

It is not a de Polignac number, because 71387009 - 2⁴ = 71386993 is a prime.

It is a super-2 number, since 2×71387009² = 10192210107932162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71387009.

It is not an unprimeable number, because it can be changed into a prime (71387059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 544874 + ... + 545004.

It is an arithmetic number, because the mean of its divisors is an integer number (2613600).

Almost surely, 2^71387009 is an apocalyptic number.

It is an amenable number.

71387009 is a deficient number, since it is larger than the sum of its proper divisors (12248191).

71387009 is a wasteful number, since it uses less digits than its factorization.

71387009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 71387009 is about 8449.0833230594. The cubic root of 71387009 is about 414.8327753218.

The spelling of 71387009 in words is "seventy-one million, three hundred eighty-seven thousand, nine".