28613689 has 8 divisors (see below), whose sum is σ = 30945992. Its totient is φ = 26300160.

The previous prime is 28613671. The next prime is 28613707. The reversal of 28613689 is 98631682.

It is an interprime number because it is at equal distance from previous prime (28613671) and next prime (28613707).

It can be written as a sum of positive squares in 4 ways, for example, as 6335289 + 22278400 = 2517^2 + 4720^2 .

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 28613689 - 2⁷ = 28613561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28613789) 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 7 ways as a sum of consecutive naturals, for example, 1434 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (3868249).

Almost surely, 2^28613689 is an apocalyptic number.

It is an amenable number.

28613689 is a deficient number, since it is larger than the sum of its proper divisors (2332303).

28613689 is a wasteful number, since it uses less digits than its factorization.

28613689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9387.

The product of its digits is 124416, while the sum is 43.

The square root of 28613689 is about 5349.1764786741. The cubic root of 28613689 is about 305.8613615780.

It can be divided in two parts, 286136 and 89, that added together give a square (286225 = 535²).

The spelling of 28613689 in words is "twenty-eight million, six hundred thirteen thousand, six hundred eighty-nine".