28740928 has 14 divisors (see below), whose sum is σ = 57032906. Its totient is φ = 14370432.

The previous prime is 28740919. The next prime is 28740979. The reversal of 28740928 is 82904782.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 8020224 = 4552^2 + 2832^2 .

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 as a sum of consecutive naturals, namely, 224475 + ... + 224602.

It is an arithmetic number, because the mean of its divisors is an integer number (4073779).

Almost surely, 2^28740928 is an apocalyptic number.

It is an amenable number.

28740928 is a deficient number, since it is larger than the sum of its proper divisors (28291978).

28740928 is an equidigital number, since it uses as much as digits as its factorization.

28740928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449089 (or 449079 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28740928 is about 5361.0566122734. The cubic root of 28740928 is about 306.3140580703.

The spelling of 28740928 in words is "twenty-eight million, seven hundred forty thousand, nine hundred twenty-eight".