28671556434 has 24 divisors (see below), whose sum is σ = 60520021200. Its totient is φ = 9054175032.

The previous prime is 28671556429. The next prime is 28671556457. The reversal of 28671556434 is 43465517682.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6616384 + ... + 6620715.

It is an arithmetic number, because the mean of its divisors is an integer number (2521667550).

Almost surely, 2^28671556434 is an apocalyptic number.

28671556434 is an abundant number, since it is smaller than the sum of its proper divisors (31848464766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28671556434 is a wasteful number, since it uses less digits than its factorization.

28671556434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13237142 (or 13237123 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 51.

The spelling of 28671556434 in words is "twenty-eight billion, six hundred seventy-one million, five hundred fifty-six thousand, four hundred thirty-four".