28513418 has 4 divisors (see below), whose sum is σ = 42770130. Its totient is φ = 14256708.

The previous prime is 28513393. The next prime is 28513423. The reversal of 28513418 is 81431582.

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., 14845609 + 13667809 = 3853^2 + 3697^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7128353 + ... + 7128356.

Almost surely, 2^28513418 is an apocalyptic number.

28513418 is a deficient number, since it is larger than the sum of its proper divisors (14256712).

28513418 is a wasteful number, since it uses less digits than its factorization.

28513418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14256711.

The product of its digits is 7680, while the sum is 32.

The square root of 28513418 is about 5339.7956889754. The cubic root of 28513418 is about 305.5036665950.

The spelling of 28513418 in words is "twenty-eight million, five hundred thirteen thousand, four hundred eighteen".