28263917728 has 12 divisors (see below), whose sum is σ = 55644588090. Its totient is φ = 14131958848.

The previous prime is 28263917699. The next prime is 28263917743. The reversal of 28263917728 is 82771936282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16948915344 + 11315002384 = 130188^2 + 106372^2 .

It is a super-3 number, since 3×28263917728³ (a number of 32 digits) contains 333 as substring.

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, 441623683 + ... + 441623746.

Almost surely, 2^28263917728 is an apocalyptic number.

It is an amenable number.

28263917728 is a deficient number, since it is larger than the sum of its proper divisors (27380670362).

28263917728 is an equidigital number, since it uses as much as digits as its factorization.

28263917728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883247439 (or 883247431 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 55.

The spelling of 28263917728 in words is "twenty-eight billion, two hundred sixty-three million, nine hundred seventeen thousand, seven hundred twenty-eight".