28745728555 has 16 divisors (see below), whose sum is σ = 36029712384. Its totient is φ = 21975305440.

The previous prime is 28745728547. The next prime is 28745728559. The reversal of 28745728555 is 55582754782.

It is not a de Polignac number, because 28745728555 - 2³ = 28745728547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28745728555.

It is not an unprimeable number, because it can be changed into a prime (28745728559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2659 + ... + 239788.

It is an arithmetic number, because the mean of its divisors is an integer number (2251857024).

Almost surely, 2^28745728555 is an apocalyptic number.

28745728555 is a deficient number, since it is larger than the sum of its proper divisors (7283983829).

28745728555 is a wasteful number, since it uses less digits than its factorization.

28745728555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243506.

The product of its digits is 31360000, while the sum is 58.

The spelling of 28745728555 in words is "twenty-eight billion, seven hundred forty-five million, seven hundred twenty-eight thousand, five hundred fifty-five".