28212575 has 6 divisors (see below), whose sum is σ = 34983624. Its totient is φ = 22570040.

The previous prime is 28212557. The next prime is 28212617. The reversal of 28212575 is 57521282.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28212575 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564227 + ... + 564276.

It is an arithmetic number, because the mean of its divisors is an integer number (5830604).

Almost surely, 2^28212575 is an apocalyptic number.

28212575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28212575 is a deficient number, since it is larger than the sum of its proper divisors (6771049).

28212575 is a wasteful number, since it uses less digits than its factorization.

28212575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128513 (or 1128508 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 28212575 is about 5311.5510917245. The cubic root of 28212575 is about 304.4254164863.

The spelling of 28212575 in words is "twenty-eight million, two hundred twelve thousand, five hundred seventy-five".