28143540977 has 2 divisors, whose sum is σ = 28143540978. Its totient is φ = 28143540976.

The previous prime is 28143540937. The next prime is 28143541003. The reversal of 28143540977 is 77904534182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28133017441 + 10523536 = 167729^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 28143540977 - 2⁶ = 28143540913 is a prime.

It is a super-2 number, since 2×28143540977² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28143540937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14071770488 + 14071770489.

It is an arithmetic number, because the mean of its divisors is an integer number (14071770489).

Almost surely, 2^28143540977 is an apocalyptic number.

It is an amenable number.

28143540977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28143540977 is an equidigital number, since it uses as much as digits as its factorization.

28143540977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 28143540977 in words is "twenty-eight billion, one hundred forty-three million, five hundred forty thousand, nine hundred seventy-seven".