28011304 has 8 divisors (see below), whose sum is σ = 52521210. Its totient is φ = 14005648.

The previous prime is 28011299. The next prime is 28011311. The reversal of 28011304 is 40311082.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 7851204 = 4490^2 + 2802^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

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 as a sum of consecutive naturals, namely, 1750699 + ... + 1750714.

Almost surely, 2^28011304 is an apocalyptic number.

It is an amenable number.

28011304 is a deficient number, since it is larger than the sum of its proper divisors (24509906).

28011304 is a wasteful number, since it uses less digits than its factorization.

28011304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3501419 (or 3501415 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28011304 is about 5292.5706419471. The cubic root of 28011304 is about 303.6997555013.

Adding to 28011304 its reverse (40311082), we get a palindrome (68322386).

The spelling of 28011304 in words is "twenty-eight million, eleven thousand, three hundred four".