28608973 has 2 divisors, whose sum is σ = 28608974. Its totient is φ = 28608972.

The previous prime is 28608967. The next prime is 28608989. The reversal of 28608973 is 37980682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27857284 + 751689 = 5278^2 + 867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28608973 is a prime.

It is a super-2 number, since 2×28608973² = 1636946672229458, which contains 22 as substring.

It is equal to p_1776949 and since 28608973 and 1776949 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28608473) 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 as a sum of consecutive naturals, namely, 14304486 + 14304487.

It is an arithmetic number, because the mean of its divisors is an integer number (14304487).

Almost surely, 2^28608973 is an apocalyptic number.

It is an amenable number.

28608973 is a deficient number, since it is larger than the sum of its proper divisors (1).

28608973 is an equidigital number, since it uses as much as digits as its factorization.

28608973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28608973 is about 5348.7356449913. The cubic root of 28608973 is about 305.8445570171.

The spelling of 28608973 in words is "twenty-eight million, six hundred eight thousand, nine hundred seventy-three".