28158776881 has 8 divisors (see below), whose sum is σ = 29937470400. Its totient is φ = 26426283312.

The previous prime is 28158776879. The next prime is 28158776939. The reversal of 28158776881 is 18867785182.

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 28158776881 - 2¹ = 28158776879 is a prime.

It is a super-4 number, since 4×28158776881⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28158776801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11548731 + ... + 11551168.

It is an arithmetic number, because the mean of its divisors is an integer number (3742183800).

Almost surely, 2^28158776881 is an apocalyptic number.

It is an amenable number.

28158776881 is a deficient number, since it is larger than the sum of its proper divisors (1778693519).

28158776881 is a wasteful number, since it uses less digits than its factorization.

28158776881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23099975.

The product of its digits is 12042240, while the sum is 61.

The spelling of 28158776881 in words is "twenty-eight billion, one hundred fifty-eight million, seven hundred seventy-six thousand, eight hundred eighty-one".