28909064 has 8 divisors (see below), whose sum is σ = 54204510. Its totient is φ = 14454528.

The previous prime is 28909063. The next prime is 28909079. The reversal of 28909064 is 46090982.

It can be written as a sum of positive squares in only one way, i.e., 28536964 + 372100 = 5342^2 + 610^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28909063) by changing a digit.

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, 1806809 + ... + 1806824.

Almost surely, 2^28909064 is an apocalyptic number.

It is an amenable number.

28909064 is a deficient number, since it is larger than the sum of its proper divisors (25295446).

28909064 is a wasteful number, since it uses less digits than its factorization.

28909064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613639 (or 3613635 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 28909064 is about 5376.7149822173. The cubic root of 28909064 is about 306.9102150553.

The spelling of 28909064 in words is "twenty-eight million, nine hundred nine thousand, sixty-four".