28217330 has 8 divisors (see below), whose sum is σ = 50791212. Its totient is φ = 11286928.

The previous prime is 28217327. The next prime is 28217363. The reversal of 28217330 is 3371282.

It can be written as a sum of positive squares in 2 ways, for example, as 28206721 + 10609 = 5311^2 + 103^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28217330.

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, 1410857 + ... + 1410876.

Almost surely, 2^28217330 is an apocalyptic number.

28217330 is a deficient number, since it is larger than the sum of its proper divisors (22573882).

28217330 is a wasteful number, since it uses less digits than its factorization.

28217330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821740.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 28217330 is about 5311.9986822288. The cubic root of 28217330 is about 304.4425183347.

The spelling of 28217330 in words is "twenty-eight million, two hundred seventeen thousand, three hundred thirty".