28621871312 has 10 divisors (see below), whose sum is σ = 55454875698. Its totient is φ = 14310935648.

The previous prime is 28621871297. The next prime is 28621871321. The reversal of 28621871312 is 21317812682.

It can be written as a sum of positive squares in only one way, i.e., 24162837136 + 4459034176 = 155444^2 + 66776^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28621871312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 894433463 + ... + 894433494.

Almost surely, 2^28621871312 is an apocalyptic number.

It is an amenable number.

28621871312 is a deficient number, since it is larger than the sum of its proper divisors (26833004386).

28621871312 is a wasteful number, since it uses less digits than its factorization.

28621871312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788866965 (or 1788866959 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The spelling of 28621871312 in words is "twenty-eight billion, six hundred twenty-one million, eight hundred seventy-one thousand, three hundred twelve".