28531018 has 4 divisors (see below), whose sum is σ = 42796530. Its totient is φ = 14265508.

The previous prime is 28530979. The next prime is 28531051. The reversal of 28531018 is 81013582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15186609 + 13344409 = 3897^2 + 3653^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7132753 + ... + 7132756.

Almost surely, 2^28531018 is an apocalyptic number.

28531018 is a deficient number, since it is larger than the sum of its proper divisors (14265512).

28531018 is a wasteful number, since it uses less digits than its factorization.

28531018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14265511.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28531018 is about 5341.4434378733. The cubic root of 28531018 is about 305.5665113770.

The spelling of 28531018 in words is "twenty-eight million, five hundred thirty-one thousand, eighteen".