728121167 has 2 divisors, whose sum is σ = 728121168. Its totient is φ = 728121166.

The previous prime is 728121139. The next prime is 728121179. The reversal of 728121167 is 761121827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728121167 - 2¹⁰ = 728120143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728121467) by changing a digit.

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, 364060583 + 364060584.

It is an arithmetic number, because the mean of its divisors is an integer number (364060584).

Almost surely, 2^728121167 is an apocalyptic number.

728121167 is a deficient number, since it is larger than the sum of its proper divisors (1).

728121167 is an equidigital number, since it uses as much as digits as its factorization.

728121167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 35.

The square root of 728121167 is about 26983.7204069417. The cubic root of 728121167 is about 899.6381949010.

The spelling of 728121167 in words is "seven hundred twenty-eight million, one hundred twenty-one thousand, one hundred sixty-seven".