28243765447919 has 16 divisors (see below), whose sum is σ = 32294549763840. Its totient is φ = 24196973209920.

The previous prime is 28243765447913. The next prime is 28243765448021. The reversal of 28243765447919 is 91974456734282.

It is not a de Polignac number, because 28243765447919 - 2²⁴ = 28243748670703 is a prime.

It is a super-2 number, since 2×28243765447919² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243765447913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194097212 + ... + 194242670.

It is an arithmetic number, because the mean of its divisors is an integer number (2018409360240).

Almost surely, 2^{28243765447919} is an apocalyptic number.

28243765447919 is a deficient number, since it is larger than the sum of its proper divisors (4050784315921).

28243765447919 is a wasteful number, since it uses less digits than its factorization.

28243765447919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158990.

The product of its digits is 731566080, while the sum is 71.

The spelling of 28243765447919 in words is "twenty-eight trillion, two hundred forty-three billion, seven hundred sixty-five million, four hundred forty-seven thousand, nine hundred nineteen".