28112302538 has 4 divisors (see below), whose sum is σ = 42168453810. Its totient is φ = 14056151268.

The previous prime is 28112302531. The next prime is 28112302571. The reversal of 28112302538 is 83520321182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28028451889 + 83850649 = 167417^2 + 9157^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28112302498 and 28112302507.

It is not an unprimeable number, because it can be changed into a prime (28112302531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7028075633 + ... + 7028075636.

Almost surely, 2^28112302538 is an apocalyptic number.

28112302538 is a deficient number, since it is larger than the sum of its proper divisors (14056151272).

28112302538 is a wasteful number, since it uses less digits than its factorization.

28112302538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14056151271.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 28112302538 in words is "twenty-eight billion, one hundred twelve million, three hundred two thousand, five hundred thirty-eight".