28478564227 has 8 divisors (see below), whose sum is σ = 28612942064. Its totient is φ = 28344424608.

The previous prime is 28478564221. The next prime is 28478564239. The reversal of 28478564227 is 72246587482.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28478564227 is a prime.

It is a super-2 number, since 2×28478564227² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28478564221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182413 + ... + 300385.

It is an arithmetic number, because the mean of its divisors is an integer number (3576617758).

Almost surely, 2^28478564227 is an apocalyptic number.

28478564227 is a deficient number, since it is larger than the sum of its proper divisors (134377837).

28478564227 is a wasteful number, since it uses less digits than its factorization.

28478564227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119109.

The product of its digits is 12042240, while the sum is 55.

The spelling of 28478564227 in words is "twenty-eight billion, four hundred seventy-eight million, five hundred sixty-four thousand, two hundred twenty-seven".