28449638501 has 2 divisors, whose sum is σ = 28449638502. Its totient is φ = 28449638500.

The previous prime is 28449638491. The next prime is 28449638593. The reversal of 28449638501 is 10583694482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28422588100 + 27050401 = 168590^2 + 5201^2 .

It is a cyclic number.

It is not a de Polignac number, because 28449638501 - 2²² = 28445444197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28449638501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28449637501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224819250 + 14224819251.

It is an arithmetic number, because the mean of its divisors is an integer number (14224819251).

Almost surely, 2^28449638501 is an apocalyptic number.

It is an amenable number.

28449638501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449638501 is an equidigital number, since it uses as much as digits as its factorization.

28449638501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 28449638501 in words is "twenty-eight billion, four hundred forty-nine million, six hundred thirty-eight thousand, five hundred one".