28704553 has 2 divisors, whose sum is σ = 28704554. Its totient is φ = 28704552.

The previous prime is 28704541. The next prime is 28704593. The reversal of 28704553 is 35540782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28387584 + 316969 = 5328^2 + 563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28704553 is a prime.

It is not a weakly prime, because it can be changed into another prime (28704523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352276 + 14352277.

It is an arithmetic number, because the mean of its divisors is an integer number (14352277).

Almost surely, 2^28704553 is an apocalyptic number.

It is an amenable number.

28704553 is a deficient number, since it is larger than the sum of its proper divisors (1).

28704553 is an equidigital number, since it uses as much as digits as its factorization.

28704553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 28704553 is about 5357.6630166519. The cubic root of 28704553 is about 306.1847781141.

The spelling of 28704553 in words is "twenty-eight million, seven hundred four thousand, five hundred fifty-three".