28921744 has 10 divisors (see below), whose sum is σ = 56035910. Its totient is φ = 14460864.

The previous prime is 28921727. The next prime is 28921771. The reversal of 28921744 is 44712982.

It can be written as a sum of positive squares in only one way, i.e., 28090000 + 831744 = 5300^2 + 912^2 .

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 as a sum of consecutive naturals, namely, 903789 + ... + 903820.

It is an arithmetic number, because the mean of its divisors is an integer number (5603591).

Almost surely, 2^28921744 is an apocalyptic number.

It is an amenable number.

28921744 is a deficient number, since it is larger than the sum of its proper divisors (27114166).

28921744 is a wasteful number, since it uses less digits than its factorization.

28921744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807617 (or 1807611 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 28921744 is about 5377.8940115997. The cubic root of 28921744 is about 306.9550804844.

The spelling of 28921744 in words is "twenty-eight million, nine hundred twenty-one thousand, seven hundred forty-four".