71729489 has 4 divisors (see below), whose sum is σ = 77247156. Its totient is φ = 66211824.

The previous prime is 71729453. The next prime is 71729491. The reversal of 71729489 is 98492717.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16851025 + 54878464 = 4105^2 + 7408^2 .

It is a cyclic number.

It is not a de Polignac number, because 71729489 - 2¹² = 71725393 is a prime.

It is a super-2 number, since 2×71729489² = 10290239184402242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71729419) 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, 2758814 + ... + 2758839.

It is an arithmetic number, because the mean of its divisors is an integer number (19311789).

Almost surely, 2^71729489 is an apocalyptic number.

It is an amenable number.

71729489 is a deficient number, since it is larger than the sum of its proper divisors (5517667).

71729489 is a wasteful number, since it uses less digits than its factorization.

71729489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5517666.

The product of its digits is 254016, while the sum is 47.

The square root of 71729489 is about 8469.3263604610. The cubic root of 71729489 is about 415.4951056125.

It can be divided in two parts, 7172 and 9489, that added together give a palindrome (16661).

The spelling of 71729489 in words is "seventy-one million, seven hundred twenty-nine thousand, four hundred eighty-nine".