28420512 has 24 divisors (see below), whose sum is σ = 74604096. Its totient is φ = 9473472.

The previous prime is 28420501. The next prime is 28420531. The reversal of 28420512 is 21502482.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 147928 + ... + 148119.

It is an arithmetic number, because the mean of its divisors is an integer number (3108504).

Almost surely, 2^28420512 is an apocalyptic number.

It is an amenable number.

28420512 is an abundant number, since it is smaller than the sum of its proper divisors (46183584).

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

28420512 is a wasteful number, since it uses less digits than its factorization.

28420512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296060 (or 296052 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28420512 is about 5331.0891945268. The cubic root of 28420512 is about 305.1714954195.

Adding to 28420512 its reverse (21502482), we get a palindrome (49922994).

The spelling of 28420512 in words is "twenty-eight million, four hundred twenty thousand, five hundred twelve".