28947315640321 has 8 divisors (see below), whose sum is σ = 31242246746984. Its totient is φ = 26662129464960.

The previous prime is 28947315640319. The next prime is 28947315640343. The reversal of 28947315640321 is 12304651374982.

It can be written as a sum of positive squares in 4 ways, for example, as 2575383040000 + 26371932600321 = 1604800^2 + 5135361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28947315640321 - 2¹ = 28947315640319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28947315640351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2436226650 + ... + 2436238531.

It is an arithmetic number, because the mean of its divisors is an integer number (3905280843373).

It is a 2-persistent number, because it is pandigital, and so is 2⋅28947315640321 = 57894631280642, but 3⋅28947315640321 = 86841946920963 is not.

Almost surely, 2^{28947315640321} is an apocalyptic number.

It is an amenable number.

28947315640321 is a deficient number, since it is larger than the sum of its proper divisors (2294931106663).

28947315640321 is a wasteful number, since it uses less digits than its factorization.

28947315640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4872465651.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 28947315640321 in words is "twenty-eight trillion, nine hundred forty-seven billion, three hundred fifteen million, six hundred forty thousand, three hundred twenty-one".