71689729 has 8 divisors (see below), whose sum is σ = 73494432. Its totient is φ = 69891360.

The previous prime is 71689721. The next prime is 71689733. The reversal of 71689729 is 92798617.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71689729 - 2³ = 71689721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71689721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28149 + ... + 30589.

It is an arithmetic number, because the mean of its divisors is an integer number (9186804).

Almost surely, 2^71689729 is an apocalyptic number.

It is an amenable number.

71689729 is a deficient number, since it is larger than the sum of its proper divisors (1804703).

71689729 is a wasteful number, since it uses less digits than its factorization.

71689729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167.

The product of its digits is 381024, while the sum is 49.

The square root of 71689729 is about 8466.9787409678. The cubic root of 71689729 is about 415.4183211130.

The spelling of 71689729 in words is "seventy-one million, six hundred eighty-nine thousand, seven hundred twenty-nine".