28072004 has 12 divisors (see below), whose sum is σ = 49799484. Its totient is φ = 13843584.

The previous prime is 28071997. The next prime is 28072007. The reversal of 28072004 is 40027082.

It can be written as a sum of positive squares in 2 ways, for example, as 20232004 + 7840000 = 4498^2 + 2800^2 .

It is not an unprimeable number, because it can be changed into a prime (28072007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47777 + ... + 48360.

It is an arithmetic number, because the mean of its divisors is an integer number (4149957).

Almost surely, 2^28072004 is an apocalyptic number.

It is an amenable number.

28072004 is a deficient number, since it is larger than the sum of its proper divisors (21727480).

28072004 is a wasteful number, since it uses less digits than its factorization.

28072004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96214 (or 96212 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 28072004 is about 5298.3019921481. The cubic root of 28072004 is about 303.9189678993.

Adding to 28072004 its reverse (40027082), we get a palindrome (68099086).

The spelling of 28072004 in words is "twenty-eight million, seventy-two thousand, four".