28218141 has 12 divisors (see below), whose sum is σ = 46582432. Its totient is φ = 16124616.

The previous prime is 28218121. The next prime is 28218163. The reversal of 28218141 is 14181282.

It is not a de Polignac number, because 28218141 - 2⁵ = 28218109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223891 + ... + 224016.

Almost surely, 2^28218141 is an apocalyptic number.

28218141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28218141 is a deficient number, since it is larger than the sum of its proper divisors (18364291).

28218141 is a wasteful number, since it uses less digits than its factorization.

28218141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447920 (or 447917 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 28218141 is about 5312.0750182956. The cubic root of 28218141 is about 304.4454349881.

The spelling of 28218141 in words is "twenty-eight million, two hundred eighteen thousand, one hundred forty-one".