28554215121 has 16 divisors (see below), whose sum is σ = 44790926400. Its totient is φ = 17916369984.

The previous prime is 28554215117. The next prime is 28554215147. The reversal of 28554215121 is 12151245582.

28554215121 is a `hidden beast` number, since 2 + 85 + 542 + 15 + 1 + 21 = 666.

It is not a de Polignac number, because 28554215121 - 2² = 28554215117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28554210121) 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, 31104351 + ... + 31105268.

It is an arithmetic number, because the mean of its divisors is an integer number (2799432900).

Almost surely, 2^28554215121 is an apocalyptic number.

It is an amenable number.

28554215121 is a deficient number, since it is larger than the sum of its proper divisors (16236711279).

28554215121 is a wasteful number, since it uses less digits than its factorization.

28554215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62209645 (or 62209639 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The spelling of 28554215121 in words is "twenty-eight billion, five hundred fifty-four million, two hundred fifteen thousand, one hundred twenty-one".