28077411421 has 2 divisors, whose sum is σ = 28077411422. Its totient is φ = 28077411420.

The previous prime is 28077411389. The next prime is 28077411449. The reversal of 28077411421 is 12411477082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24920095321 + 3157316100 = 157861^2 + 56190^2 .

It is a cyclic number.

It is not a de Polignac number, because 28077411421 - 2⁵ = 28077411389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28077411121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14038705710 + 14038705711.

It is an arithmetic number, because the mean of its divisors is an integer number (14038705711).

Almost surely, 2^28077411421 is an apocalyptic number.

It is an amenable number.

28077411421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28077411421 is an equidigital number, since it uses as much as digits as its factorization.

28077411421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 37.

The spelling of 28077411421 in words is "twenty-eight billion, seventy-seven million, four hundred eleven thousand, four hundred twenty-one".