28130811919 has 8 divisors (see below), whose sum is σ = 32159952000. Its totient is φ = 24104285016.

The previous prime is 28130811899. The next prime is 28130811923. The reversal of 28130811919 is 91911803182.

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

It is not a de Polignac number, because 28130811919 - 2⁹ = 28130811407 is a prime.

It is a super-2 number, since 2×28130811919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130811959) 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, 630169 + ... + 673330.

It is an arithmetic number, because the mean of its divisors is an integer number (4019994000).

Almost surely, 2^28130811919 is an apocalyptic number.

28130811919 is a deficient number, since it is larger than the sum of its proper divisors (4029140081).

28130811919 is a wasteful number, since it uses less digits than its factorization.

28130811919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306589.

The product of its (nonzero) digits is 31104, while the sum is 43.

The spelling of 28130811919 in words is "twenty-eight billion, one hundred thirty million, eight hundred eleven thousand, nine hundred nineteen".