28551908897273 has 2 divisors, whose sum is σ = 28551908897274. Its totient is φ = 28551908897272.

The previous prime is 28551908897231. The next prime is 28551908897321. The reversal of 28551908897273 is 37279880915582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24300877286464 + 4251031610809 = 4929592^2 + 2061803^2 .

It is a cyclic number.

It is not a de Polignac number, because 28551908897273 - 2²⁰ = 28551907848697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28551908897273.

It is not a weakly prime, because it can be changed into another prime (28551908807273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14275954448636 + 14275954448637.

It is an arithmetic number, because the mean of its divisors is an integer number (14275954448637).

Almost surely, 2^{28551908897273} is an apocalyptic number.

It is an amenable number.

28551908897273 is a deficient number, since it is larger than the sum of its proper divisors (1).

28551908897273 is an equidigital number, since it uses as much as digits as its factorization.

28551908897273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 609638400, while the sum is 74.

The spelling of 28551908897273 in words is "twenty-eight trillion, five hundred fifty-one billion, nine hundred eight million, eight hundred ninety-seven thousand, two hundred seventy-three".