28278277057 has 2 divisors, whose sum is σ = 28278277058. Its totient is φ = 28278277056.

The previous prime is 28278277033. The next prime is 28278277091. The reversal of 28278277057 is 75077287282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28267360641 + 10916416 = 168129^2 + 3304^2 .

It is a cyclic number.

It is not a de Polignac number, because 28278277057 - 2¹¹ = 28278275009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28278276989 and 28278277007.

It is not a weakly prime, because it can be changed into another prime (28278277457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14139138528 + 14139138529.

It is an arithmetic number, because the mean of its divisors is an integer number (14139138529).

Almost surely, 2^28278277057 is an apocalyptic number.

It is an amenable number.

28278277057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28278277057 is an equidigital number, since it uses as much as digits as its factorization.

28278277057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6146560, while the sum is 55.

The spelling of 28278277057 in words is "twenty-eight billion, two hundred seventy-eight million, two hundred seventy-seven thousand, fifty-seven".