28036380881 has 2 divisors, whose sum is σ = 28036380882. Its totient is φ = 28036380880.

The previous prime is 28036380877. The next prime is 28036380899. The reversal of 28036380881 is 18808363082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16190017600 + 11846363281 = 127240^2 + 108841^2 .

It is a cyclic number.

It is not a de Polignac number, because 28036380881 - 2² = 28036380877 is a prime.

It is a super-2 number, since 2×28036380881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28036380871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14018190440 + 14018190441.

It is an arithmetic number, because the mean of its divisors is an integer number (14018190441).

Almost surely, 2^28036380881 is an apocalyptic number.

It is an amenable number.

28036380881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28036380881 is an equidigital number, since it uses as much as digits as its factorization.

28036380881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 47.

The spelling of 28036380881 in words is "twenty-eight billion, thirty-six million, three hundred eighty thousand, eight hundred eighty-one".