28581631959 has 8 divisors (see below), whose sum is σ = 38115300352. Its totient is φ = 19051192440.

The previous prime is 28581631957. The next prime is 28581632011. The reversal of 28581631959 is 95913618582.

It is a happy number.

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

It is not a de Polignac number, because 28581631959 - 2¹ = 28581631957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28581631899 and 28581631908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28581631957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786487 + ... + 822024.

It is an arithmetic number, because the mean of its divisors is an integer number (4764412544).

Almost surely, 2^28581631959 is an apocalyptic number.

28581631959 is a deficient number, since it is larger than the sum of its proper divisors (9533668393).

28581631959 is a wasteful number, since it uses less digits than its factorization.

28581631959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614437.

The product of its digits is 4665600, while the sum is 57.

The spelling of 28581631959 in words is "twenty-eight billion, five hundred eighty-one million, six hundred thirty-one thousand, nine hundred fifty-nine".