28705064 has 8 divisors (see below), whose sum is σ = 53822010. Its totient is φ = 14352528.

The previous prime is 28705049. The next prime is 28705069. The reversal of 28705064 is 46050782.

It can be written as a sum of positive squares in only one way, i.e., 28536964 + 168100 = 5342^2 + 410^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28705064.

It is not an unprimeable number, because it can be changed into a prime (28705069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1794059 + ... + 1794074.

Almost surely, 2^28705064 is an apocalyptic number.

It is an amenable number.

28705064 is a deficient number, since it is larger than the sum of its proper divisors (25116946).

28705064 is a wasteful number, since it uses less digits than its factorization.

28705064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588139 (or 3588135 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 28705064 is about 5357.7107051426. The cubic root of 28705064 is about 306.1865950092.

The spelling of 28705064 in words is "twenty-eight million, seven hundred five thousand, sixty-four".