28466928721 has 24 divisors (see below), whose sum is σ = 36167747616. Its totient is φ = 22155779520.

The previous prime is 28466928701. The next prime is 28466928727. The reversal of 28466928721 is 12782966482.

It is not a de Polignac number, because 28466928721 - 2⁷ = 28466928593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28466928727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 431110 + ... + 492736.

It is an arithmetic number, because the mean of its divisors is an integer number (1506989484).

Almost surely, 2^28466928721 is an apocalyptic number.

It is an amenable number.

28466928721 is a deficient number, since it is larger than the sum of its proper divisors (7700818895).

28466928721 is a wasteful number, since it uses less digits than its factorization.

28466928721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62509 (or 62502 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The spelling of 28466928721 in words is "twenty-eight billion, four hundred sixty-six million, nine hundred twenty-eight thousand, seven hundred twenty-one".