28357688834 has 16 divisors (see below), whose sum is σ = 42794551800. Its totient is φ = 14092922880.

The previous prime is 28357688833. The next prime is 28357688861. The reversal of 28357688834 is 43888675382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16155172609 + 12202516225 = 127103^2 + 110465^2 .

It is not an unprimeable number, because it can be changed into a prime (28357688833) 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, 685442 + ... + 725634.

Almost surely, 2^28357688834 is an apocalyptic number.

28357688834 is a deficient number, since it is larger than the sum of its proper divisors (14436862966).

28357688834 is a wasteful number, since it uses less digits than its factorization.

28357688834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42325.

The product of its digits is 61931520, while the sum is 62.

The spelling of 28357688834 in words is "twenty-eight billion, three hundred fifty-seven million, six hundred eighty-eight thousand, eight hundred thirty-four".