69328721 has 16 divisors (see below), whose sum is σ = 86627328. Its totient is φ = 53902800.

The previous prime is 69328681. The next prime is 69328733. The reversal of 69328721 is 12782396.

It is not a de Polignac number, because 69328721 - 2¹⁰ = 69327697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (69328621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52556 + ... + 53858.

It is an arithmetic number, because the mean of its divisors is an integer number (5414208).

Almost surely, 2^69328721 is an apocalyptic number.

It is an amenable number.

69328721 is a deficient number, since it is larger than the sum of its proper divisors (17298607).

69328721 is a wasteful number, since it uses less digits than its factorization.

69328721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its digits is 36288, while the sum is 38.

The square root of 69328721 is about 8326.3870316002. The cubic root of 69328721 is about 410.8068999346.

The spelling of 69328721 in words is "sixty-nine million, three hundred twenty-eight thousand, seven hundred twenty-one".