28380004 has 24 divisors (see below), whose sum is σ = 54286848. Its totient is φ = 12923520.

The previous prime is 28379993. The next prime is 28380019. The reversal of 28380004 is 40008382.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 4624 + ... + 8839.

It is an arithmetic number, because the mean of its divisors is an integer number (2261952).

Almost surely, 2^28380004 is an apocalyptic number.

It is an amenable number.

28380004 is a deficient number, since it is larger than the sum of its proper divisors (25906844).

28380004 is a wasteful number, since it uses less digits than its factorization.

28380004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13515 (or 13513 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28380004 is about 5327.2886161724. The cubic root of 28380004 is about 305.0264386290.

Adding to 28380004 its reverse (40008382), we get a palindrome (68388386).

The spelling of 28380004 in words is "twenty-eight million, three hundred eighty thousand, four".