28757545521 has 16 divisors (see below), whose sum is σ = 38969136000. Its totient is φ = 18860992128.

The previous prime is 28757545507. The next prime is 28757545543. The reversal of 28757545521 is 12554575782.

It is not a de Polignac number, because 28757545521 - 2⁷ = 28757545393 is a prime.

It is a super-2 number, since 2×28757545521² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28757545501) 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, 217486 + ... + 323751.

It is an arithmetic number, because the mean of its divisors is an integer number (2435571000).

Almost surely, 2^28757545521 is an apocalyptic number.

It is an amenable number.

28757545521 is a deficient number, since it is larger than the sum of its proper divisors (10211590479).

28757545521 is a wasteful number, since it uses less digits than its factorization.

28757545521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541528.

The product of its digits is 3920000, while the sum is 51.

The spelling of 28757545521 in words is "twenty-eight billion, seven hundred fifty-seven million, five hundred forty-five thousand, five hundred twenty-one".