28345110538 has 4 divisors (see below), whose sum is σ = 42517665810. Its totient is φ = 14172555268.

The previous prime is 28345110527. The next prime is 28345110551. The reversal of 28345110538 is 83501154382.

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., 28084061889 + 261048649 = 167583^2 + 16157^2 .

It is a super-2 number, since 2×28345110538² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28345110538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7086277633 + ... + 7086277636.

Almost surely, 2^28345110538 is an apocalyptic number.

28345110538 is a deficient number, since it is larger than the sum of its proper divisors (14172555272).

28345110538 is a wasteful number, since it uses less digits than its factorization.

28345110538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14172555271.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 28345110538 in words is "twenty-eight billion, three hundred forty-five million, one hundred ten thousand, five hundred thirty-eight".