728056657 has 2 divisors, whose sum is σ = 728056658. Its totient is φ = 728056656.

The previous prime is 728056619. The next prime is 728056663. The reversal of 728056657 is 756650827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715883536 + 12173121 = 26756^2 + 3489^2 .

It is an emirp because it is prime and its reverse (756650827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728056657 - 2¹¹ = 728054609 is a prime.

It is not a weakly prime, because it can be changed into another prime (728056157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364028328 + 364028329.

It is an arithmetic number, because the mean of its divisors is an integer number (364028329).

Almost surely, 2^728056657 is an apocalyptic number.

It is an amenable number.

728056657 is a deficient number, since it is larger than the sum of its proper divisors (1).

728056657 is an equidigital number, since it uses as much as digits as its factorization.

728056657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 728056657 is about 26982.5250301005. The cubic root of 728056657 is about 899.6116254340.

The spelling of 728056657 in words is "seven hundred twenty-eight million, fifty-six thousand, six hundred fifty-seven".