728621039 has 2 divisors, whose sum is σ = 728621040. Its totient is φ = 728621038.

The previous prime is 728620999. The next prime is 728621041. The reversal of 728621039 is 930126827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728621039 - 2²⁴ = 711843823 is a prime.

Together with 728621041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 728620993 and 728621011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728621059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364310519 + 364310520.

It is an arithmetic number, because the mean of its divisors is an integer number (364310520).

Almost surely, 2^728621039 is an apocalyptic number.

728621039 is a deficient number, since it is larger than the sum of its proper divisors (1).

728621039 is an equidigital number, since it uses as much as digits as its factorization.

728621039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 728621039 is about 26992.9812914394. The cubic root of 728621039 is about 899.8440219404.

The spelling of 728621039 in words is "seven hundred twenty-eight million, six hundred twenty-one thousand, thirty-nine".