28437966121 has 16 divisors (see below), whose sum is σ = 30498848640. Its totient is φ = 26438227200.

The previous prime is 28437966097. The next prime is 28437966143. The reversal of 28437966121 is 12166973482.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28437966121 - 2⁹ = 28437965609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28437966191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151276 + ... + 282418.

It is an arithmetic number, because the mean of its divisors is an integer number (1906178040).

Almost surely, 2^28437966121 is an apocalyptic number.

It is an amenable number.

28437966121 is a deficient number, since it is larger than the sum of its proper divisors (2060882519).

28437966121 is a wasteful number, since it uses less digits than its factorization.

28437966121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131376.

The product of its digits is 870912, while the sum is 49.

The spelling of 28437966121 in words is "twenty-eight billion, four hundred thirty-seven million, nine hundred sixty-six thousand, one hundred twenty-one".