28052545 has 4 divisors (see below), whose sum is σ = 33663060. Its totient is φ = 22442032.

The previous prime is 28052537. The next prime is 28052573. The reversal of 28052545 is 54525082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3964081 + 24088464 = 1991^2 + 4908^2 .

It is a cyclic number.

It is not a de Polignac number, because 28052545 - 2³ = 28052537 is a prime.

It is a super-3 number, since 3×28052545³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2805250 + ... + 2805259.

It is an arithmetic number, because the mean of its divisors is an integer number (8415765).

Almost surely, 2^28052545 is an apocalyptic number.

It is an amenable number.

28052545 is a deficient number, since it is larger than the sum of its proper divisors (5610515).

28052545 is an equidigital number, since it uses as much as digits as its factorization.

28052545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610514.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 28052545 is about 5296.4653307654. The cubic root of 28052545 is about 303.8487279763.

It can be divided in two parts, 280 and 52545, that multiplied together give a triangular number (14712600 = T₅₄₂₄).

The spelling of 28052545 in words is "twenty-eight million, fifty-two thousand, five hundred forty-five".