28404500566121 has 4 divisors (see below), whose sum is σ = 28746723464592. Its totient is φ = 28062277667652.

The previous prime is 28404500566073. The next prime is 28404500566139. The reversal of 28404500566121 is 12166500540482.

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 a de Polignac number, because none of the positive numbers 2^k-28404500566121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28404500566181) 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, 171111449111 + ... + 171111449276.

It is an arithmetic number, because the mean of its divisors is an integer number (7186680866148).

Almost surely, 2^{28404500566121} is an apocalyptic number.

It is an amenable number.

28404500566121 is a deficient number, since it is larger than the sum of its proper divisors (342222898471).

28404500566121 is an equidigital number, since it uses as much as digits as its factorization.

28404500566121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342222898470.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 28404500566121 in words is "twenty-eight trillion, four hundred four billion, five hundred million, five hundred sixty-six thousand, one hundred twenty-one".