727732561 has 2 divisors, whose sum is σ = 727732562. Its totient is φ = 727732560.

The previous prime is 727732553. The next prime is 727732589. The reversal of 727732561 is 165237727.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718240000 + 9492561 = 26800^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 727732561 - 2³ = 727732553 is a prime.

It is not a weakly prime, because it can be changed into another prime (727732591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363866280 + 363866281.

It is an arithmetic number, because the mean of its divisors is an integer number (363866281).

Almost surely, 2^727732561 is an apocalyptic number.

It is an amenable number.

727732561 is a deficient number, since it is larger than the sum of its proper divisors (1).

727732561 is an equidigital number, since it uses as much as digits as its factorization.

727732561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 40.

The square root of 727732561 is about 26976.5186968222. The cubic root of 727732561 is about 899.4781175995.

The spelling of 727732561 in words is "seven hundred twenty-seven million, seven hundred thirty-two thousand, five hundred sixty-one".