28664541 has 6 divisors (see below), whose sum is σ = 41404350. Its totient is φ = 19109688.

The previous prime is 28664539. The next prime is 28664549. The reversal of 28664541 is 14546682.

28664541 is a `hidden beast` number, since 2 + 8 + 6 + 645 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 1572516 = 5205^2 + 1254^2 .

It is not a de Polignac number, because 28664541 - 2¹ = 28664539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28664496 and 28664505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28664549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1592466 + ... + 1592483.

It is an arithmetic number, because the mean of its divisors is an integer number (6900725).

Almost surely, 2^28664541 is an apocalyptic number.

It is an amenable number.

28664541 is a deficient number, since it is larger than the sum of its proper divisors (12739809).

28664541 is a wasteful number, since it uses less digits than its factorization.

28664541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3184955 (or 3184952 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 28664541 is about 5353.9276237170. The cubic root of 28664541 is about 306.0424457332.

The spelling of 28664541 in words is "twenty-eight million, six hundred sixty-four thousand, five hundred forty-one".