28056275 has 24 divisors (see below), whose sum is σ = 37758000. Its totient is φ = 20557440.

The previous prime is 28056269. The next prime is 28056277. The reversal of 28056275 is 57265082.

It is a de Polignac number, because none of the positive numbers 2^k-28056275 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28056277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55976 + ... + 56474.

It is an arithmetic number, because the mean of its divisors is an integer number (1573250).

Almost surely, 2^28056275 is an apocalyptic number.

28056275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28056275 is the 4325-th pentagonal number.

28056275 is a deficient number, since it is larger than the sum of its proper divisors (9701725).

28056275 is a wasteful number, since it uses less digits than its factorization.

28056275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 28056275 is about 5296.8174406902. The cubic root of 28056275 is about 303.8621944375.

The spelling of 28056275 in words is "twenty-eight million, fifty-six thousand, two hundred seventy-five".