28329613 has 8 divisors (see below), whose sum is σ = 31085208. Its totient is φ = 25656384.

The previous prime is 28329557. The next prime is 28329649. The reversal of 28329613 is 31692382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4485924 + 23843689 = 2118^2 + 4883^2 .

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

It is not a de Polignac number, because 28329613 - 2²¹ = 26232461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28329313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19870 + ... + 21247.

It is an arithmetic number, because the mean of its divisors is an integer number (3885651).

Almost surely, 2^28329613 is an apocalyptic number.

It is an amenable number.

28329613 is a deficient number, since it is larger than the sum of its proper divisors (2755595).

28329613 is a wasteful number, since it uses less digits than its factorization.

28329613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41183.

The product of its digits is 15552, while the sum is 34.

The square root of 28329613 is about 5322.5569982857. The cubic root of 28329613 is about 304.8457986087.

The spelling of 28329613 in words is "twenty-eight million, three hundred twenty-nine thousand, six hundred thirteen".