28503061 has 4 divisors (see below), whose sum is σ = 29273452. Its totient is φ = 27732672.

The previous prime is 28503053. The next prime is 28503071. The reversal of 28503061 is 16030582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16030582 = 2 ⋅8015291.

It can be written as a sum of positive squares in 2 ways, for example, as 10176100 + 18326961 = 3190^2 + 4281^2 .

It is a cyclic number.

It is not a de Polignac number, because 28503061 - 2³ = 28503053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28503011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385140 + ... + 385213.

It is an arithmetic number, because the mean of its divisors is an integer number (7318363).

Almost surely, 2^28503061 is an apocalyptic number.

It is an amenable number.

28503061 is a deficient number, since it is larger than the sum of its proper divisors (770391).

28503061 is an equidigital number, since it uses as much as digits as its factorization.

28503061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770390.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 28503061 is about 5338.8258072351. The cubic root of 28503061 is about 305.4666724956.

The spelling of 28503061 in words is "twenty-eight million, five hundred three thousand, sixty-one".