247828729 has 2 divisors, whose sum is σ = 247828730. Its totient is φ = 247828728.

The previous prime is 247828727. The next prime is 247828769. The reversal of 247828729 is 927828742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232501504 + 15327225 = 15248^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 247828729 - 2¹ = 247828727 is a prime.

It is a super-2 number, since 2×247828729² = 122838157835510882, which contains 22 as substring.

Together with 247828727, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247828727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123914364 + 123914365.

It is an arithmetic number, because the mean of its divisors is an integer number (123914365).

Almost surely, 2^247828729 is an apocalyptic number.

It is an amenable number.

247828729 is a deficient number, since it is larger than the sum of its proper divisors (1).

247828729 is an equidigital number, since it uses as much as digits as its factorization.

247828729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 49.

The square root of 247828729 is about 15742.5769491529. The cubic root of 247828729 is about 628.1314661480.

The spelling of 247828729 in words is "two hundred forty-seven million, eight hundred twenty-eight thousand, seven hundred twenty-nine".