28540534431428 has 12 divisors (see below), whose sum is σ = 51295825397292. Its totient is φ = 13884584317920.

The previous prime is 28540534431407. The next prime is 28540534431457. The reversal of 28540534431428 is 82413443504582.

It can be written as a sum of positive squares in 2 ways, for example, as 15812536344004 + 12727998087424 = 3976498^2 + 3567632^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28540534431428.

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, 96420724283 + ... + 96420724578.

It is an arithmetic number, because the mean of its divisors is an integer number (4274652116441).

Almost surely, 2^{28540534431428} is an apocalyptic number.

It is an amenable number.

28540534431428 is a deficient number, since it is larger than the sum of its proper divisors (22755290965864).

28540534431428 is a wasteful number, since it uses less digits than its factorization.

28540534431428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192841448902 (or 192841448900 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 53.

The spelling of 28540534431428 in words is "twenty-eight trillion, five hundred forty billion, five hundred thirty-four million, four hundred thirty-one thousand, four hundred twenty-eight".