28380504 has 16 divisors (see below), whose sum is σ = 70951320. Its totient is φ = 9460160.

The previous prime is 28380479. The next prime is 28380523. The reversal of 28380504 is 40508382.

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 3 ways as a sum of consecutive naturals, for example, 591237 + ... + 591284.

Almost surely, 2^28380504 is an apocalyptic number.

28380504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28380504 is an abundant number, since it is smaller than the sum of its proper divisors (42570816).

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

28380504 is a wasteful number, since it uses less digits than its factorization.

28380504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182530 (or 1182526 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28380504 is about 5327.3355441534. The cubic root of 28380504 is about 305.0282299410.

Adding to 28380504 its reverse (40508382), we get a palindrome (68888886).

The spelling of 28380504 in words is "twenty-eight million, three hundred eighty thousand, five hundred four".