65989729 has 4 divisors (see below), whose sum is σ = 71065876. Its totient is φ = 60913584.

The previous prime is 65989711. The next prime is 65989741. The reversal of 65989729 is 92798956.

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 4524129 + 61465600 = 2127^2 + 7840^2 .

It is a cyclic number.

It is not a de Polignac number, because 65989729 - 2¹¹ = 65987681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65989729.

It is not an unprimeable number, because it can be changed into a prime (65989709) 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, 2538054 + ... + 2538079.

It is an arithmetic number, because the mean of its divisors is an integer number (17766469).

Almost surely, 2^65989729 is an apocalyptic number.

It is an amenable number.

65989729 is a deficient number, since it is larger than the sum of its proper divisors (5076147).

65989729 is a wasteful number, since it uses less digits than its factorization.

65989729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076146.

The product of its digits is 2449440, while the sum is 55.

The square root of 65989729 is about 8123.4062436887. The cubic root of 65989729 is about 404.1030375523.

The spelling of 65989729 in words is "sixty-five million, nine hundred eighty-nine thousand, seven hundred twenty-nine".