28004957503 has 4 divisors (see below), whose sum is σ = 28006972000. Its totient is φ = 28002943008.

The previous prime is 28004957447. The next prime is 28004957557. The reversal of 28004957503 is 30575940082.

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 28004957503 - 2²¹ = 28002860351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28004957503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004957593) 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, 986250 + ... + 1014247.

It is an arithmetic number, because the mean of its divisors is an integer number (7001743000).

Almost surely, 2^28004957503 is an apocalyptic number.

28004957503 is a deficient number, since it is larger than the sum of its proper divisors (2014497).

28004957503 is a wasteful number, since it uses less digits than its factorization.

28004957503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014496.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 28004957503 in words is "twenty-eight billion, four million, nine hundred fifty-seven thousand, five hundred three".