728385871 has 2 divisors, whose sum is σ = 728385872. Its totient is φ = 728385870.

The previous prime is 728385803. The next prime is 728385887. The reversal of 728385871 is 178583827.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728385871 - 2²³ = 719997263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728380871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364192935 + 364192936.

It is an arithmetic number, because the mean of its divisors is an integer number (364192936).

Almost surely, 2^728385871 is an apocalyptic number.

728385871 is a deficient number, since it is larger than the sum of its proper divisors (1).

728385871 is an equidigital number, since it uses as much as digits as its factorization.

728385871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 49.

The square root of 728385871 is about 26988.6248445526. The cubic root of 728385871 is about 899.7472010150.

The spelling of 728385871 in words is "seven hundred twenty-eight million, three hundred eighty-five thousand, eight hundred seventy-one".