28545111 has 48 divisors (see below), whose sum is σ = 49061376. Its totient is φ = 15657408.

The previous prime is 28545089. The next prime is 28545113. The reversal of 28545111 is 11154582.

28545111 is a `hidden beast` number, since 2 + 8 + 545 + 111 = 666.

It is not a de Polignac number, because 28545111 - 2⁷ = 28544983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28545113) 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 47 ways as a sum of consecutive naturals, for example, 277086 + ... + 277188.

It is an arithmetic number, because the mean of its divisors is an integer number (1022112).

Almost surely, 2^28545111 is an apocalyptic number.

28545111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28545111 is a deficient number, since it is larger than the sum of its proper divisors (20516265).

28545111 is a wasteful number, since it uses less digits than its factorization.

28545111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 249 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 28545111 is about 5342.7624877024. The cubic root of 28545111 is about 305.6168149915.

Adding to 28545111 its reverse (11154582), we get a palindrome (39699693).

The spelling of 28545111 in words is "twenty-eight million, five hundred forty-five thousand, one hundred eleven".