28307502238 has 16 divisors (see below), whose sum is σ = 42778886400. Its totient is φ = 14048204800.

The previous prime is 28307502229. The next prime is 28307502239. The reversal of 28307502238 is 83220570382.

It is a self number, because there is not a number n which added to its sum of digits gives 28307502238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28307502239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88998 + ... + 254038.

It is an arithmetic number, because the mean of its divisors is an integer number (2673680400).

Almost surely, 2^28307502238 is an apocalyptic number.

28307502238 is a deficient number, since it is larger than the sum of its proper divisors (14471384162).

28307502238 is a wasteful number, since it uses less digits than its factorization.

28307502238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165683.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 28307502238 in words is "twenty-eight billion, three hundred seven million, five hundred two thousand, two hundred thirty-eight".