28549018 has 16 divisors (see below), whose sum is σ = 45475560. Its totient is φ = 13395456.

The previous prime is 28549013. The next prime is 28549051. The reversal of 28549018 is 81094582.

It can be written as a sum of positive squares in 4 ways, for example, as 28547649 + 1369 = 5343^2 + 37^2 .

It is not an unprimeable number, because it can be changed into a prime (28549013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12880 + ... + 14932.

Almost surely, 2^28549018 is an apocalyptic number.

28549018 is a deficient number, since it is larger than the sum of its proper divisors (16926542).

28549018 is a wasteful number, since it uses less digits than its factorization.

28549018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28549018 is about 5343.1281100120. The cubic root of 28549018 is about 305.6307577226.

The spelling of 28549018 in words is "twenty-eight million, five hundred forty-nine thousand, eighteen".