28450018 has 4 divisors (see below), whose sum is σ = 42675030. Its totient is φ = 14225008.

The previous prime is 28450001. The next prime is 28450031. The reversal of 28450018 is 81005482.

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., 26904969 + 1545049 = 5187^2 + 1243^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7112503 + ... + 7112506.

Almost surely, 2^28450018 is an apocalyptic number.

28450018 is a deficient number, since it is larger than the sum of its proper divisors (14225012).

28450018 is a wasteful number, since it uses less digits than its factorization.

28450018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14225011.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28450018 is about 5333.8558285728. The cubic root of 28450018 is about 305.2770679468.

The spelling of 28450018 in words is "twenty-eight million, four hundred fifty thousand, eighteen".