28005748072 has 8 divisors (see below), whose sum is σ = 52510777650. Its totient is φ = 14002874032.

The previous prime is 28005748051. The next prime is 28005748093. The reversal of 28005748072 is 27084750082.

It is an interprime number because it is at equal distance from previous prime (28005748051) and next prime (28005748093).

It can be written as a sum of positive squares in only one way, i.e., 28000667556 + 5080516 = 167334^2 + 2254^2 .

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, 1750359247 + ... + 1750359262.

Almost surely, 2^28005748072 is an apocalyptic number.

It is an amenable number.

28005748072 is a deficient number, since it is larger than the sum of its proper divisors (24505029578).

28005748072 is a wasteful number, since it uses less digits than its factorization.

28005748072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500718515 (or 3500718511 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 43.

The spelling of 28005748072 in words is "twenty-eight billion, five million, seven hundred forty-eight thousand, seventy-two".