28544780 has 24 divisors (see below), whose sum is σ = 65394000. Its totient is φ = 10379840.

The previous prime is 28544777. The next prime is 28544801. The reversal of 28544780 is 8744582.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 64655 + ... + 65094.

It is an arithmetic number, because the mean of its divisors is an integer number (2724750).

Almost surely, 2^28544780 is an apocalyptic number.

28544780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28544780 is an abundant number, since it is smaller than the sum of its proper divisors (36849220).

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

28544780 is a wasteful number, since it uses less digits than its factorization.

28544780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129769 (or 129767 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 28544780 is about 5342.7315111280. The cubic root of 28544780 is about 305.6156337086.

The spelling of 28544780 in words is "twenty-eight million, five hundred forty-four thousand, seven hundred eighty".