28428828649 has 12 divisors (see below), whose sum is σ = 31129782300. Its totient is φ = 25947128064.

The previous prime is 28428828613. The next prime is 28428828653. The reversal of 28428828649 is 94682882482.

It can be written as a sum of positive squares in 6 ways, for example, as 11390225625 + 17038603024 = 106725^2 + 130532^2 .

It is not a de Polignac number, because 28428828649 - 2³¹ = 26281345001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28428828049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 930004 + ... + 960085.

It is an arithmetic number, because the mean of its divisors is an integer number (2594148525).

Almost surely, 2^28428828649 is an apocalyptic number.

It is an amenable number.

28428828649 is a deficient number, since it is larger than the sum of its proper divisors (2700953651).

28428828649 is a wasteful number, since it uses less digits than its factorization.

28428828649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890204 (or 1890191 counting only the distinct ones).

The product of its digits is 28311552, while the sum is 61.

The spelling of 28428828649 in words is "twenty-eight billion, four hundred twenty-eight million, eight hundred twenty-eight thousand, six hundred forty-nine".