28881775641 has 8 divisors (see below), whose sum is σ = 38509839520. Its totient is φ = 19254114432.

The previous prime is 28881775597. The next prime is 28881775661. The reversal of 28881775641 is 14657718882.

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

It is not a de Polignac number, because 28881775641 - 2¹⁰ = 28881774617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28881775661) 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, 172905 + ... + 296073.

It is an arithmetic number, because the mean of its divisors is an integer number (4813729940).

Almost surely, 2^28881775641 is an apocalyptic number.

It is an amenable number.

28881775641 is a deficient number, since it is larger than the sum of its proper divisors (9628063879).

28881775641 is a wasteful number, since it uses less digits than its factorization.

28881775641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201335.

The product of its digits is 6021120, while the sum is 57.

The spelling of 28881775641 in words is "twenty-eight billion, eight hundred eighty-one million, seven hundred seventy-five thousand, six hundred forty-one".