28727758081 has 8 divisors (see below), whose sum is σ = 31780772928. Its totient is φ = 25748310000.

The previous prime is 28727758049. The next prime is 28727758117. The reversal of 28727758081 is 18085772782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28727758081 - 2⁵ = 28727758049 is a prime.

It is a super-2 number, since 2×28727758081² (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 (28727750081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18390870 + ... + 18392431.

It is an arithmetic number, because the mean of its divisors is an integer number (3972596616).

Almost surely, 2^28727758081 is an apocalyptic number.

It is an amenable number.

28727758081 is a deficient number, since it is larger than the sum of its proper divisors (3053014847).

28727758081 is a wasteful number, since it uses less digits than its factorization.

28727758081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36783383.

The product of its (nonzero) digits is 3512320, while the sum is 55.

The spelling of 28727758081 in words is "twenty-eight billion, seven hundred twenty-seven million, seven hundred fifty-eight thousand, eighty-one".