28754489 has 4 divisors (see below), whose sum is σ = 29455860. Its totient is φ = 28053120.

The previous prime is 28754471. The next prime is 28754549. The reversal of 28754489 is 98445782.

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: 98445782 = 2 ⋅49222891.

It can be written as a sum of positive squares in 2 ways, for example, as 2948089 + 25806400 = 1717^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 28754489 - 2⁸ = 28754233 is a prime.

It is a super-2 number, since 2×28754489² = 1653641275302242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28754419) 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, 350624 + ... + 350705.

It is an arithmetic number, because the mean of its divisors is an integer number (7363965).

Almost surely, 2^28754489 is an apocalyptic number.

It is an amenable number.

28754489 is a deficient number, since it is larger than the sum of its proper divisors (701371).

28754489 is an equidigital number, since it uses as much as digits as its factorization.

28754489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701370.

The product of its digits is 645120, while the sum is 47.

The square root of 28754489 is about 5362.3212324515. The cubic root of 28754489 is about 306.3622271458.

The spelling of 28754489 in words is "twenty-eight million, seven hundred fifty-four thousand, four hundred eighty-nine".