28128530251 has 8 divisors (see below), whose sum is σ = 29147076000. Its totient is φ = 27113224320.

The previous prime is 28128530219. The next prime is 28128530291. The reversal of 28128530251 is 15203582182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28128530251 - 2⁵ = 28128530219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28128530251.

It is not an unprimeable number, because it can be changed into a prime (28128530201) 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 in 7 ways as a sum of consecutive naturals, for example, 792270 + ... + 827011.

It is an arithmetic number, because the mean of its divisors is an integer number (3643384500).

Almost surely, 2^28128530251 is an apocalyptic number.

28128530251 is a deficient number, since it is larger than the sum of its proper divisors (1018545749).

28128530251 is a wasteful number, since it uses less digits than its factorization.

28128530251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619909.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 28128530251 in words is "twenty-eight billion, one hundred twenty-eight million, five hundred thirty thousand, two hundred fifty-one".