28912575 has 12 divisors (see below), whose sum is σ = 47802248. Its totient is φ = 15420000.

The previous prime is 28912573. The next prime is 28912579. The reversal of 28912575 is 57521982.

It is not a de Polignac number, because 28912575 - 2¹ = 28912573 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 (28912571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192676 + ... + 192825.

Almost surely, 2^28912575 is an apocalyptic number.

28912575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28912575 is a deficient number, since it is larger than the sum of its proper divisors (18889673).

28912575 is a wasteful number, since it uses less digits than its factorization.

28912575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385514 (or 385509 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 28912575 is about 5377.0414727804. The cubic root of 28912575 is about 306.9226392802.

The spelling of 28912575 in words is "twenty-eight million, nine hundred twelve thousand, five hundred seventy-five".