28122004 has 6 divisors (see below), whose sum is σ = 49213514. Its totient is φ = 14061000.

The previous prime is 28122001. The next prime is 28122007. The reversal of 28122004 is 40022182.

It is an interprime number because it is at equal distance from previous prime (28122001) and next prime (28122007).

It can be written as a sum of positive squares in only one way, i.e., 27562500 + 559504 = 5250^2 + 748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122001) 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 as a sum of consecutive naturals, namely, 3515247 + ... + 3515254.

Almost surely, 2^28122004 is an apocalyptic number.

It is an amenable number.

28122004 is a deficient number, since it is larger than the sum of its proper divisors (21091510).

28122004 is a wasteful number, since it uses less digits than its factorization.

28122004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7030505 (or 7030503 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 28122004 is about 5303.0183857875. The cubic root of 28122004 is about 304.0993010087.

Adding to 28122004 its reverse (40022182), we get a palindrome (68144186).

The spelling of 28122004 in words is "twenty-eight million, one hundred twenty-two thousand, four".