28115541 has 12 divisors (see below), whose sum is σ = 41476032. Its totient is φ = 18344616.

The previous prime is 28115533. The next prime is 28115557. The reversal of 28115541 is 14551182.

28115541 is a `hidden beast` number, since 2 + 8 + 115 + 541 = 666.

It is not a de Polignac number, because 28115541 - 2³ = 28115533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28115531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32811 + ... + 33656.

It is an arithmetic number, because the mean of its divisors is an integer number (3456336).

Almost surely, 2^28115541 is an apocalyptic number.

It is an amenable number.

28115541 is a deficient number, since it is larger than the sum of its proper divisors (13360491).

28115541 is a wasteful number, since it uses less digits than its factorization.

28115541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66520 (or 66517 counting only the distinct ones).

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

The square root of 28115541 is about 5302.4089808313. The cubic root of 28115541 is about 304.0760031863.

The spelling of 28115541 in words is "twenty-eight million, one hundred fifteen thousand, five hundred forty-one".