28734689668 has 12 divisors (see below), whose sum is σ = 51234494220. Its totient is φ = 14096262752.

The previous prime is 28734689647. The next prime is 28734689677. The reversal of 28734689668 is 86698643782.

It can be written as a sum of positive squares in 2 ways, for example, as 25820633344 + 2914056324 = 160688^2 + 53982^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67770283 + ... + 67770706.

It is an arithmetic number, because the mean of its divisors is an integer number (4269541185).

Almost surely, 2^28734689668 is an apocalyptic number.

It is an amenable number.

28734689668 is a deficient number, since it is larger than the sum of its proper divisors (22499804552).

28734689668 is a wasteful number, since it uses less digits than its factorization.

28734689668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135541046 (or 135541044 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 67.

The spelling of 28734689668 in words is "twenty-eight billion, seven hundred thirty-four million, six hundred eighty-nine thousand, six hundred sixty-eight".