28512749 has 8 divisors (see below), whose sum is σ = 30182880. Its totient is φ = 26859600.

The previous prime is 28512739. The next prime is 28512763. The reversal of 28512749 is 94721582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28512749 - 2¹⁶ = 28447213 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 (28512719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (3772860).

Almost surely, 2^28512749 is an apocalyptic number.

It is an amenable number.

28512749 is a deficient number, since it is larger than the sum of its proper divisors (1670131).

28512749 is a wasteful number, since it uses less digits than its factorization.

28512749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8491.

The product of its digits is 40320, while the sum is 38.

The square root of 28512749 is about 5339.7330457617. The cubic root of 28512749 is about 305.5012772690.

The spelling of 28512749 in words is "twenty-eight million, five hundred twelve thousand, seven hundred forty-nine".