28478814568 has 8 divisors (see below), whose sum is σ = 53397777330. Its totient is φ = 14239407280.

The previous prime is 28478814557. The next prime is 28478814587. The reversal of 28478814568 is 86541887482.

It can be written as a sum of positive squares in only one way, i.e., 27895012324 + 583802244 = 167018^2 + 24162^2 .

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

It is a super-2 number, since 2×28478814568² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1779925903 + ... + 1779925918.

Almost surely, 2^28478814568 is an apocalyptic number.

It is an amenable number.

28478814568 is a deficient number, since it is larger than the sum of its proper divisors (24918962762).

28478814568 is a wasteful number, since it uses less digits than its factorization.

28478814568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559851827 (or 3559851823 counting only the distinct ones).

The product of its digits is 27525120, while the sum is 61.

The spelling of 28478814568 in words is "twenty-eight billion, four hundred seventy-eight million, eight hundred fourteen thousand, five hundred sixty-eight".