28731557228 has 12 divisors (see below), whose sum is σ = 54851154792. Its totient is φ = 13059798720.

The previous prime is 28731557221. The next prime is 28731557269. The reversal of 28731557228 is 82275513782.

It is not an unprimeable number, because it can be changed into a prime (28731557221) 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, 326494925 + ... + 326495012.

It is an arithmetic number, because the mean of its divisors is an integer number (4570929566).

Almost surely, 2^28731557228 is an apocalyptic number.

It is an amenable number.

28731557228 is a deficient number, since it is larger than the sum of its proper divisors (26119597564).

28731557228 is a wasteful number, since it uses less digits than its factorization.

28731557228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652989952 (or 652989950 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 50.

The spelling of 28731557228 in words is "twenty-eight billion, seven hundred thirty-one million, five hundred fifty-seven thousand, two hundred twenty-eight".