28457746513921 has 4 divisors (see below), whose sum is σ = 28514322551232. Its totient is φ = 28401170476612.

The previous prime is 28457746513879. The next prime is 28457746513981. The reversal of 28457746513921 is 12931564775482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28457746513921 - 2⁷ = 28457746513793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28457746513981) 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, 28288017901 + ... + 28288018906.

It is an arithmetic number, because the mean of its divisors is an integer number (7128580637808).

Almost surely, 2^{28457746513921} is an apocalyptic number.

It is an amenable number.

28457746513921 is a deficient number, since it is larger than the sum of its proper divisors (56576037311).

28457746513921 is an equidigital number, since it uses as much as digits as its factorization.

28457746513921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56576037310.

The product of its digits is 101606400, while the sum is 64.

The spelling of 28457746513921 in words is "twenty-eight trillion, four hundred fifty-seven billion, seven hundred forty-six million, five hundred thirteen thousand, nine hundred twenty-one".