28752109 has 8 divisors (see below), whose sum is σ = 29449728. Its totient is φ = 28058160.

The previous prime is 28752103. The next prime is 28752121. The reversal of 28752109 is 90125782.

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 28752109 - 2¹⁹ = 28227821 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 (28752103) 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, 21004 + ... + 22330.

It is an arithmetic number, because the mean of its divisors is an integer number (3681216).

Almost surely, 2^28752109 is an apocalyptic number.

It is an amenable number.

28752109 is a deficient number, since it is larger than the sum of its proper divisors (697619).

28752109 is a wasteful number, since it uses less digits than its factorization.

28752109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28752109 is about 5362.0993090393. The cubic root of 28752109 is about 306.3537744109.

The spelling of 28752109 in words is "twenty-eight million, seven hundred fifty-two thousand, one hundred nine".