28378052513 has 2 divisors, whose sum is σ = 28378052514. Its totient is φ = 28378052512.

The previous prime is 28378052503. The next prime is 28378052557. The reversal of 28378052513 is 31525087382.

It is an a-pointer prime, because the next prime (28378052557) can be obtained adding 28378052513 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22968008704 + 5410043809 = 151552^2 + 73553^2 .

It is a cyclic number.

It is not a de Polignac number, because 28378052513 - 2¹² = 28378048417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28378052503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14189026256 + 14189026257.

It is an arithmetic number, because the mean of its divisors is an integer number (14189026257).

Almost surely, 2^28378052513 is an apocalyptic number.

It is an amenable number.

28378052513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28378052513 is an equidigital number, since it uses as much as digits as its factorization.

28378052513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 28378052513 in words is "twenty-eight billion, three hundred seventy-eight million, fifty-two thousand, five hundred thirteen".