28645553 has 4 divisors (see below), whose sum is σ = 28712448. Its totient is φ = 28578660.

The previous prime is 28645531. The next prime is 28645567. The reversal of 28645553 is 35554682.

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: 35554682 = 2 ⋅17777341.

It is a cyclic number.

It is not a de Polignac number, because 28645553 - 2⁶ = 28645489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28645523) 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, 32801 + ... + 33662.

It is an arithmetic number, because the mean of its divisors is an integer number (7178112).

Almost surely, 2^28645553 is an apocalyptic number.

It is an amenable number.

28645553 is a deficient number, since it is larger than the sum of its proper divisors (66895).

28645553 is an equidigital number, since it uses as much as digits as its factorization.

28645553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66894.

The product of its digits is 144000, while the sum is 38.

The square root of 28645553 is about 5352.1540523419. The cubic root of 28645553 is about 305.9748544704.

The spelling of 28645553 in words is "twenty-eight million, six hundred forty-five thousand, five hundred fifty-three".