28751441 has 4 divisors (see below), whose sum is σ = 29742900. Its totient is φ = 27759984.

The previous prime is 28751431. The next prime is 28751447. The reversal of 28751441 is 14415782.

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: 14415782 = 2 ⋅7207891.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 8761600 = 4471^2 + 2960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28751441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28751398 and 28751407.

It is not an unprimeable number, because it can be changed into a prime (28751447) 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, 495686 + ... + 495743.

It is an arithmetic number, because the mean of its divisors is an integer number (7435725).

Almost surely, 2^28751441 is an apocalyptic number.

It is an amenable number.

28751441 is a deficient number, since it is larger than the sum of its proper divisors (991459).

28751441 is an equidigital number, since it uses as much as digits as its factorization.

28751441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991458.

The product of its digits is 8960, while the sum is 32.

The square root of 28751441 is about 5362.0370196409. The cubic root of 28751441 is about 306.3514018788.

It can be divided in two parts, 28751 and 441, that added together give a palindrome (29192).

The spelling of 28751441 in words is "twenty-eight million, seven hundred fifty-one thousand, four hundred forty-one".