28567939720321 has 32 divisors (see below), whose sum is σ = 30173190220800. Its totient is φ = 27011659161600.

The previous prime is 28567939720277. The next prime is 28567939720381. The reversal of 28567939720321 is 12302793976582.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28567939720321 is a prime.

It is a super-2 number, since 2×28567939720321² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28567939720381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589625505 + ... + 589673953.

It is an arithmetic number, because the mean of its divisors is an integer number (942912194400).

Almost surely, 2^{28567939720321} is an apocalyptic number.

It is an amenable number.

28567939720321 is a deficient number, since it is larger than the sum of its proper divisors (1605250500479).

28567939720321 is a wasteful number, since it uses less digits than its factorization.

28567939720321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50617.

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 28567939720321 in words is "twenty-eight trillion, five hundred sixty-seven billion, nine hundred thirty-nine million, seven hundred twenty thousand, three hundred twenty-one".