28803128565 has 32 divisors (see below), whose sum is σ = 49175095680. Its totient is φ = 14353790976.

The previous prime is 28803128561. The next prime is 28803128569. The reversal of 28803128565 is 56582130882.

It is an interprime number because it is at equal distance from previous prime (28803128561) and next prime (28803128569).

It is not a de Polignac number, because 28803128565 - 2² = 28803128561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28803128561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671412 + ... + 713021.

It is an arithmetic number, because the mean of its divisors is an integer number (1536721740).

Almost surely, 2^28803128565 is an apocalyptic number.

It is an amenable number.

28803128565 is a deficient number, since it is larger than the sum of its proper divisors (20371967115).

28803128565 is a wasteful number, since it uses less digits than its factorization.

28803128565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384533.

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 28803128565 in words is "twenty-eight billion, eight hundred three million, one hundred twenty-eight thousand, five hundred sixty-five".