28666648403 has 4 divisors (see below), whose sum is σ = 28778192040. Its totient is φ = 28555104768.

The previous prime is 28666648357. The next prime is 28666648519. The reversal of 28666648403 is 30484666682.

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 28666648403 - 2²² = 28662454099 is a prime.

It is a super-2 number, since 2×28666648403² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28666644403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55771433 + ... + 55771946.

It is an arithmetic number, because the mean of its divisors is an integer number (7194548010).

Almost surely, 2^28666648403 is an apocalyptic number.

28666648403 is a deficient number, since it is larger than the sum of its proper divisors (111543637).

28666648403 is a wasteful number, since it uses less digits than its factorization.

28666648403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111543636.

The product of its (nonzero) digits is 7962624, while the sum is 53.

The spelling of 28666648403 in words is "twenty-eight billion, six hundred sixty-six million, six hundred forty-eight thousand, four hundred three".