28626840508881 has 4 divisors (see below), whose sum is σ = 38169120678512. Its totient is φ = 19084560339252.

The previous prime is 28626840508867. The next prime is 28626840508913. The reversal of 28626840508881 is 18880504862682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28626840508881 - 2¹⁹ = 28626839984593 is a prime.

It is a super-2 number, since 2×28626840508881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28626840508781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4771140084811 + ... + 4771140084816.

It is an arithmetic number, because the mean of its divisors is an integer number (9542280169628).

Almost surely, 2^{28626840508881} is an apocalyptic number.

It is an amenable number.

28626840508881 is a deficient number, since it is larger than the sum of its proper divisors (9542280169631).

28626840508881 is an equidigital number, since it uses as much as digits as its factorization.

28626840508881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9542280169630.

The product of its (nonzero) digits is 94371840, while the sum is 66.

The spelling of 28626840508881 in words is "twenty-eight trillion, six hundred twenty-six billion, eight hundred forty million, five hundred eight thousand, eight hundred eighty-one".