28748680553 has 4 divisors (see below), whose sum is σ = 28755232128. Its totient is φ = 28742128980.

The previous prime is 28748680549. The next prime is 28748680591. The reversal of 28748680553 is 35508684782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35508684782 = 2 ⋅17754342391.

It is a cyclic number.

It is not a de Polignac number, because 28748680553 - 2² = 28748680549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28748680153) 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 in 3 ways as a sum of consecutive naturals, for example, 3269201 + ... + 3277982.

It is an arithmetic number, because the mean of its divisors is an integer number (7188808032).

Almost surely, 2^28748680553 is an apocalyptic number.

It is an amenable number.

28748680553 is a deficient number, since it is larger than the sum of its proper divisors (6551575).

28748680553 is an equidigital number, since it uses as much as digits as its factorization.

28748680553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551574.

The product of its (nonzero) digits is 12902400, while the sum is 56.

The spelling of 28748680553 in words is "twenty-eight billion, seven hundred forty-eight million, six hundred eighty thousand, five hundred fifty-three".