728700081173 has 2 divisors, whose sum is σ = 728700081174. Its totient is φ = 728700081172.

The previous prime is 728700081167. The next prime is 728700081191. The reversal of 728700081173 is 371180007827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679341905284 + 49358175889 = 824222^2 + 222167^2 .

It is a cyclic number.

It is not a de Polignac number, because 728700081173 - 2²⁸ = 728431645717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728700081073) 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, 364350040586 + 364350040587.

It is an arithmetic number, because the mean of its divisors is an integer number (364350040587).

Almost surely, 2^728700081173 is an apocalyptic number.

It is an amenable number.

728700081173 is a deficient number, since it is larger than the sum of its proper divisors (1).

728700081173 is an equidigital number, since it uses as much as digits as its factorization.

728700081173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131712, while the sum is 44.

The spelling of 728700081173 in words is "seven hundred twenty-eight billion, seven hundred million, eighty-one thousand, one hundred seventy-three".