28752489 has 16 divisors (see below), whose sum is σ = 43125440. Its totient is φ = 19166868.

The previous prime is 28752481. The next prime is 28752523. The reversal of 28752489 is 98425782.

It is not a de Polignac number, because 28752489 - 2³ = 28752481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28752481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4387 + ... + 8760.

It is an arithmetic number, because the mean of its divisors is an integer number (2695340).

Almost surely, 2^28752489 is an apocalyptic number.

It is an amenable number.

28752489 is a deficient number, since it is larger than the sum of its proper divisors (14372951).

28752489 is an frugal number, since it uses more digits than its factorization.

28752489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13168 (or 13150 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 28752489 is about 5362.1347428053. The cubic root of 28752489 is about 306.3551240385.

It can be divided in two parts, 28752 and 489, that added together give a square (29241 = 171²).

The spelling of 28752489 in words is "twenty-eight million, seven hundred fifty-two thousand, four hundred eighty-nine".