28771920061881 has 16 divisors (see below), whose sum is σ = 41013542254464. Its totient is φ = 17877697899264.

The previous prime is 28771920061877. The next prime is 28771920061883. The reversal of 28771920061881 is 18816002917782.

It is not a de Polignac number, because 28771920061881 - 2² = 28771920061877 is a prime.

It is a super-2 number, since 2×28771920061881² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28771920061883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2738612686 + ... + 2738623191.

It is an arithmetic number, because the mean of its divisors is an integer number (2563346390904).

Almost surely, 2^{28771920061881} is an apocalyptic number.

It is an amenable number.

28771920061881 is a deficient number, since it is larger than the sum of its proper divisors (12241622192583).

28771920061881 is a wasteful number, since it uses less digits than its factorization.

28771920061881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477236000.

The product of its (nonzero) digits is 5419008, while the sum is 60.

The spelling of 28771920061881 in words is "twenty-eight trillion, seven hundred seventy-one billion, nine hundred twenty million, sixty-one thousand, eight hundred eighty-one".