28910921923 has 8 divisors (see below), whose sum is σ = 31528952000. Its totient is φ = 26349193728.

The previous prime is 28910921887. The next prime is 28910921927. The reversal of 28910921923 is 32912901982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28910921923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28910921927) 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 7 ways as a sum of consecutive naturals, for example, 14074398 + ... + 14076451.

It is an arithmetic number, because the mean of its divisors is an integer number (3941119000).

Almost surely, 2^28910921923 is an apocalyptic number.

28910921923 is a deficient number, since it is larger than the sum of its proper divisors (2618030077).

28910921923 is a wasteful number, since it uses less digits than its factorization.

28910921923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28150941.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 28910921923 in words is "twenty-eight billion, nine hundred ten million, nine hundred twenty-one thousand, nine hundred twenty-three".