28212975 has 72 divisors (see below), whose sum is σ = 60360720. Its totient is φ = 12882240.

The previous prime is 28212971. The next prime is 28213067. The reversal of 28212975 is 57921282.

It is not a de Polignac number, because 28212975 - 2² = 28212971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28212971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32649 + ... + 33501.

Almost surely, 2^28212975 is an apocalyptic number.

28212975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28212975 is an abundant number, since it is smaller than the sum of its proper divisors (32147745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28212975 is a wasteful number, since it uses less digits than its factorization.

28212975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 868 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28212975 is about 5311.5887453755. The cubic root of 28212975 is about 304.4268552016.

The spelling of 28212975 in words is "twenty-eight million, two hundred twelve thousand, nine hundred seventy-five".