28123814438434 has 96 divisors (see below), whose sum is σ = 49931752734720. Its totient is φ = 11776878360000.

The previous prime is 28123814438431. The next prime is 28123814438491. The reversal of 28123814438434 is 43483441832182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28123814438431) 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 47 ways as a sum of consecutive naturals, for example, 7089439519 + ... + 7089443485.

It is an arithmetic number, because the mean of its divisors is an integer number (520122424320).

Almost surely, 2^{28123814438434} is an apocalyptic number.

28123814438434 is a deficient number, since it is larger than the sum of its proper divisors (21807938296286).

28123814438434 is a wasteful number, since it uses less digits than its factorization.

28123814438434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296 (or 7283 counting only the distinct ones).

The product of its digits is 14155776, while the sum is 55.

The spelling of 28123814438434 in words is "twenty-eight trillion, one hundred twenty-three billion, eight hundred fourteen million, four hundred thirty-eight thousand, four hundred thirty-four".