28404872 has 8 divisors (see below), whose sum is σ = 53259150. Its totient is φ = 14202432.

The previous prime is 28404853. The next prime is 28404881. The reversal of 28404872 is 27840482.

It can be written as a sum of positive squares in only one way, i.e., 17422276 + 10982596 = 4174^2 + 3314^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775297 + ... + 1775312.

Almost surely, 2^28404872 is an apocalyptic number.

It is an amenable number.

28404872 is a deficient number, since it is larger than the sum of its proper divisors (24854278).

28404872 is a wasteful number, since it uses less digits than its factorization.

28404872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550615 (or 3550611 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28404872 is about 5329.6221254419. The cubic root of 28404872 is about 305.1155058350.

The spelling of 28404872 in words is "twenty-eight million, four hundred four thousand, eight hundred seventy-two".