28004232 has 32 divisors (see below), whose sum is σ = 71200800. Its totient is φ = 9176064.

The previous prime is 28004231. The next prime is 28004237. The reversal of 28004232 is 23240082.

It is a junction number, because it is equal to n+sod(n) for n = 28004199 and 28004208.

It is not an unprimeable number, because it can be changed into a prime (28004231) by changing a digit.

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, 8473 + ... + 11304.

It is an arithmetic number, because the mean of its divisors is an integer number (2225025).

Almost surely, 2^28004232 is an apocalyptic number.

It is an amenable number.

28004232 is an abundant number, since it is smaller than the sum of its proper divisors (43196568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28004232 is a wasteful number, since it uses less digits than its factorization.

28004232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19845 (or 19841 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 28004232 is about 5291.9024934328. The cubic root of 28004232 is about 303.6741950413.

The spelling of 28004232 in words is "twenty-eight million, four thousand, two hundred thirty-two".