28941728081 has 16 divisors (see below), whose sum is σ = 35043788160. Its totient is φ = 23333372160.

The previous prime is 28941728071. The next prime is 28941728089. The reversal of 28941728081 is 18082714982.

It is not a de Polignac number, because 28941728081 - 2²² = 28937533777 is a prime.

It is a super-2 number, since 2×28941728081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28941728089) 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, 117551 + ... + 267771.

It is an arithmetic number, because the mean of its divisors is an integer number (2190236760).

Almost surely, 2^28941728081 is an apocalyptic number.

It is an amenable number.

28941728081 is a deficient number, since it is larger than the sum of its proper divisors (6102060079).

28941728081 is a wasteful number, since it uses less digits than its factorization.

28941728081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151864.

The product of its (nonzero) digits is 516096, while the sum is 50.

The spelling of 28941728081 in words is "twenty-eight billion, nine hundred forty-one million, seven hundred twenty-eight thousand, eighty-one".