61728089 has 2 divisors, whose sum is σ = 61728090. Its totient is φ = 61728088.

The previous prime is 61728041. The next prime is 61728097. The reversal of 61728089 is 98082716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 13564489 = 6940^2 + 3683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61728089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61728019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30864044 + 30864045.

It is an arithmetic number, because the mean of its divisors is an integer number (30864045).

Almost surely, 2^61728089 is an apocalyptic number.

It is an amenable number.

61728089 is a deficient number, since it is larger than the sum of its proper divisors (1).

61728089 is an equidigital number, since it uses as much as digits as its factorization.

61728089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 61728089 is about 7856.7225355106. The cubic root of 61728089 is about 395.2097139871.

The spelling of 61728089 in words is "sixty-one million, seven hundred twenty-eight thousand, eighty-nine".