28355305864 has 8 divisors (see below), whose sum is σ = 53166198510. Its totient is φ = 14177652928.

The previous prime is 28355305837. The next prime is 28355305879. The reversal of 28355305864 is 46850355382.

It can be written as a sum of positive squares in only one way, i.e., 26807512900 + 1547792964 = 163730^2 + 39342^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1772206609 + ... + 1772206624.

Almost surely, 2^28355305864 is an apocalyptic number.

It is an amenable number.

28355305864 is a deficient number, since it is larger than the sum of its proper divisors (24810892646).

28355305864 is a wasteful number, since it uses less digits than its factorization.

28355305864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544413239 (or 3544413235 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 49.

The spelling of 28355305864 in words is "twenty-eight billion, three hundred fifty-five million, three hundred five thousand, eight hundred sixty-four".