28163330 has 16 divisors (see below), whose sum is σ = 54593784. Its totient is φ = 10398720.

The previous prime is 28163309. The next prime is 28163341. The reversal of 28163330 is 3336182.

28163330 = 345² + 346² + ... + 500².

It can be written as a sum of positive squares in 4 ways, for example, as 23493409 + 4669921 = 4847^2 + 2161^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 28163330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108191 + ... + 108450.

Almost surely, 2^28163330 is an apocalyptic number.

28163330 is a deficient number, since it is larger than the sum of its proper divisors (26430454).

28163330 is a wasteful number, since it uses less digits than its factorization.

28163330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216661.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 28163330 is about 5306.9134155364. The cubic root of 28163330 is about 304.2481886531.

The spelling of 28163330 in words is "twenty-eight million, one hundred sixty-three thousand, three hundred thirty".