28217541 has 16 divisors (see below), whose sum is σ = 41154048. Its totient is φ = 17055600.

The previous prime is 28217537. The next prime is 28217543. The reversal of 28217541 is 14571282.

It is not a de Polignac number, because 28217541 - 2² = 28217537 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28217499 and 28217508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28217543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14496 + ... + 16326.

It is an arithmetic number, because the mean of its divisors is an integer number (2572128).

Almost surely, 2^28217541 is an apocalyptic number.

It is an amenable number.

28217541 is a deficient number, since it is larger than the sum of its proper divisors (12936507).

28217541 is a wasteful number, since it uses less digits than its factorization.

28217541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312.

The product of its digits is 4480, while the sum is 30.

The square root of 28217541 is about 5312.0185428893. The cubic root of 28217541 is about 304.4432771734.

The spelling of 28217541 in words is "twenty-eight million, two hundred seventeen thousand, five hundred forty-one".