28250018 has 8 divisors (see below), whose sum is σ = 43520412. Its totient is φ = 13743216.

The previous prime is 28249999. The next prime is 28250023. The reversal of 28250018 is 81005282.

It can be written as a sum of positive squares in 2 ways, for example, as 21557449 + 6692569 = 4643^2 + 2587^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190805 + ... + 190952.

Almost surely, 2^28250018 is an apocalyptic number.

28250018 is a deficient number, since it is larger than the sum of its proper divisors (15270394).

28250018 is a wasteful number, since it uses less digits than its factorization.

28250018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381796.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 28250018 is about 5315.0745996646. The cubic root of 28250018 is about 304.5600321313.

The spelling of 28250018 in words is "twenty-eight million, two hundred fifty thousand, eighteen".