28438500949 has 16 divisors (see below), whose sum is σ = 31480168320. Its totient is φ = 25601737920.

The previous prime is 28438500947. The next prime is 28438500973. The reversal of 28438500949 is 94900583482.

It is not a de Polignac number, because 28438500949 - 2¹ = 28438500947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28438500896 and 28438500905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438500947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138094 + ... + 275584.

It is an arithmetic number, because the mean of its divisors is an integer number (1967510520).

Almost surely, 2^28438500949 is an apocalyptic number.

It is an amenable number.

28438500949 is a deficient number, since it is larger than the sum of its proper divisors (3041667371).

28438500949 is an equidigital number, since it uses as much as digits as its factorization.

28438500949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137577 (or 137531 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 28438500949 in words is "twenty-eight billion, four hundred thirty-eight million, five hundred thousand, nine hundred forty-nine".