28057745388 has 12 divisors (see below), whose sum is σ = 65468072600. Its totient is φ = 9352581792.

The previous prime is 28057745371. The next prime is 28057745393. The reversal of 28057745388 is 88354775082.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169072713 + ... + 1169072736.

Almost surely, 2^28057745388 is an apocalyptic number.

It is an amenable number.

28057745388 is an abundant number, since it is smaller than the sum of its proper divisors (37410327212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28057745388 is a wasteful number, since it uses less digits than its factorization.

28057745388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338145456 (or 2338145454 counting only the distinct ones).

The product of its (nonzero) digits is 15052800, while the sum is 57.

The spelling of 28057745388 in words is "twenty-eight billion, fifty-seven million, seven hundred forty-five thousand, three hundred eighty-eight".