728971 has 2 divisors, whose sum is σ = 728972. Its totient is φ = 728970.

The previous prime is 728969. The next prime is 728993. The reversal of 728971 is 179827.

It is a weak prime.

It is an emirp because it is prime and its reverse (179827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728971 - 2¹ = 728969 is a prime.

Together with 728969, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (728911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364485 + 364486.

It is an arithmetic number, because the mean of its divisors is an integer number (364486).

2⁷²⁸⁹⁷¹ is an apocalyptic number.

728971 is a deficient number, since it is larger than the sum of its proper divisors (1).

728971 is an equidigital number, since it uses as much as digits as its factorization.

728971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 34.

The square root of 728971 is about 853.7979854743. The cubic root of 728971 is about 89.9988065685.

The spelling of 728971 in words is "seven hundred twenty-eight thousand, nine hundred seventy-one".