28873018 has 4 divisors (see below), whose sum is σ = 43309530. Its totient is φ = 14436508.

The previous prime is 28873003. The next prime is 28873037. The reversal of 28873018 is 81037882.

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., 25938649 + 2934369 = 5093^2 + 1713^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7218253 + ... + 7218256.

Almost surely, 2^28873018 is an apocalyptic number.

28873018 is a deficient number, since it is larger than the sum of its proper divisors (14436512).

28873018 is a wasteful number, since it uses less digits than its factorization.

28873018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14436511.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 28873018 is about 5373.3618899158. The cubic root of 28873018 is about 306.7826024051.

The spelling of 28873018 in words is "twenty-eight million, eight hundred seventy-three thousand, eighteen".