28000505278003 has 4 divisors (see below), whose sum is σ = 28757275690960. Its totient is φ = 27243734865048.

The previous prime is 28000505277989. The next prime is 28000505278037. The reversal of 28000505278003 is 30087250500082.

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

It is a cyclic number.

It is not a de Polignac number, because 28000505278003 - 2⁴¹ = 25801482022451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28000505278903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378385206423 + ... + 378385206496.

It is an arithmetic number, because the mean of its divisors is an integer number (7189318922740).

Almost surely, 2^{28000505278003} is an apocalyptic number.

28000505278003 is a deficient number, since it is larger than the sum of its proper divisors (756770412957).

28000505278003 is an equidigital number, since it uses as much as digits as its factorization.

28000505278003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756770412956.

The product of its (nonzero) digits is 134400, while the sum is 40.

Adding to 28000505278003 its reverse (30087250500082), we get a palindrome (58087755778085).

The spelling of 28000505278003 in words is "twenty-eight trillion, five hundred five million, two hundred seventy-eight thousand, three".