28111545 has 144 divisors (see below), whose sum is σ = 66156480. Its totient is φ = 10886400.

The previous prime is 28111541. The next prime is 28111549. The reversal of 28111545 is 54511182.

28111545 is a `hidden beast` number, since 2 + 8 + 111 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (28111541) and next prime (28111549).

It is not a de Polignac number, because 28111545 - 2² = 28111541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111541) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 460815 + ... + 460875.

It is an arithmetic number, because the mean of its divisors is an integer number (459420).

Almost surely, 2^28111545 is an apocalyptic number.

It is an amenable number.

28111545 is an abundant number, since it is smaller than the sum of its proper divisors (38044935).

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

28111545 is a wasteful number, since it uses less digits than its factorization.

28111545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 106 counting only the distinct ones).

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

The square root of 28111545 is about 5302.0321575788. The cubic root of 28111545 is about 304.0615966193.

It can be divided in two parts, 2811 and 1545, that added together give a square (4356 = 66²).

The spelling of 28111545 in words is "twenty-eight million, one hundred eleven thousand, five hundred forty-five".