28545571 has 4 divisors (see below), whose sum is σ = 28592752. Its totient is φ = 28498392.

The previous prime is 28545563. The next prime is 28545577. The reversal of 28545571 is 17554582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28545571 - 2³ = 28545563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28545571.

It is not an unprimeable number, because it can be changed into a prime (28545577) 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, 22671 + ... + 23896.

It is an arithmetic number, because the mean of its divisors is an integer number (7148188).

Almost surely, 2^28545571 is an apocalyptic number.

28545571 is a deficient number, since it is larger than the sum of its proper divisors (47181).

28545571 is an equidigital number, since it uses as much as digits as its factorization.

28545571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47180.

The product of its digits is 56000, while the sum is 37.

The square root of 28545571 is about 5342.8055364200. The cubic root of 28545571 is about 305.6184566384.

It can be divided in two parts, 28545 and 571, that multiplied together give a triangular number (16299195 = T₅₇₀₉).

The spelling of 28545571 in words is "twenty-eight million, five hundred forty-five thousand, five hundred seventy-one".