28628379649 has 2 divisors, whose sum is σ = 28628379650. Its totient is φ = 28628379648.

The previous prime is 28628379631. The next prime is 28628379677. The reversal of 28628379649 is 94697382682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18031118400 + 10597261249 = 134280^2 + 102943^2 .

It is a cyclic number.

It is not a de Polignac number, because 28628379649 - 2⁵ = 28628379617 is a prime.

It is not a weakly prime, because it can be changed into another prime (28628379629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14314189824 + 14314189825.

It is an arithmetic number, because the mean of its divisors is an integer number (14314189825).

Almost surely, 2^28628379649 is an apocalyptic number.

It is an amenable number.

28628379649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28628379649 is an equidigital number, since it uses as much as digits as its factorization.

28628379649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 64.

The spelling of 28628379649 in words is "twenty-eight billion, six hundred twenty-eight million, three hundred seventy-nine thousand, six hundred forty-nine".