28725913191 has 32 divisors (see below), whose sum is σ = 40169168896. Its totient is φ = 18236988000.

The previous prime is 28725913091. The next prime is 28725913207. The reversal of 28725913191 is 19131952782.

It is a happy number.

It is not a de Polignac number, because 28725913191 - 2¹⁵ = 28725880423 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 28725913191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28725913091) 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 31 ways as a sum of consecutive naturals, for example, 8042436 + ... + 8046006.

It is an arithmetic number, because the mean of its divisors is an integer number (1255286528).

Almost surely, 2^28725913191 is an apocalyptic number.

28725913191 is a deficient number, since it is larger than the sum of its proper divisors (11443255705).

28725913191 is a wasteful number, since it uses less digits than its factorization.

28725913191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963.

The product of its digits is 272160, while the sum is 48.

It can be divided in two parts, 2872591 and 3191, that added together give a palindrome (2875782).

The spelling of 28725913191 in words is "twenty-eight billion, seven hundred twenty-five million, nine hundred thirteen thousand, one hundred ninety-one".