28270886026021 has 4 divisors (see below), whose sum is σ = 28271355009100. Its totient is φ = 28270417042944.

The previous prime is 28270886026007. The next prime is 28270886026037. The reversal of 28270886026021 is 12062068807282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99058120225 + 28171827905796 = 314735^2 + 5307714^2 .

It is a cyclic number.

It is not a de Polignac number, because 28270886026021 - 2²¹ = 28270883928869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28270886026021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28270886026001) 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, 234401106 + ... + 234521683.

It is an arithmetic number, because the mean of its divisors is an integer number (7067838752275).

Almost surely, 2^{28270886026021} is an apocalyptic number.

It is an amenable number.

28270886026021 is a deficient number, since it is larger than the sum of its proper divisors (468983079).

28270886026021 is an equidigital number, since it uses as much as digits as its factorization.

28270886026021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468983078.

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 28270886026021 in words is "twenty-eight trillion, two hundred seventy billion, eight hundred eighty-six million, twenty-six thousand, twenty-one".