28813553 has 4 divisors (see below), whose sum is σ = 28849140. Its totient is φ = 28777968.

The previous prime is 28813523. The next prime is 28813579. The reversal of 28813553 is 35531882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35531882 = 2 ⋅17765941.

It can be written as a sum of positive squares in 2 ways, for example, as 11607649 + 17205904 = 3407^2 + 4148^2 .

It is a cyclic number.

It is not a de Polignac number, because 28813553 - 2⁶ = 28813489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28813513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16550 + ... + 18207.

It is an arithmetic number, because the mean of its divisors is an integer number (7212285).

Almost surely, 2^28813553 is an apocalyptic number.

It is an amenable number.

28813553 is a deficient number, since it is larger than the sum of its proper divisors (35587).

28813553 is an equidigital number, since it uses as much as digits as its factorization.

28813553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35586.

The product of its digits is 28800, while the sum is 35.

The square root of 28813553 is about 5367.8257236986. The cubic root of 28813553 is about 306.5718477862.

The spelling of 28813553 in words is "twenty-eight million, eight hundred thirteen thousand, five hundred fifty-three".