65688722 has 18 divisors (see below), whose sum is σ = 108513237. Its totient is φ = 29801200.

The previous prime is 65688709. The next prime is 65688739. The reversal of 65688722 is 22788656.

65688722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 62552281 + 3136441 = 7909^2 + 1771^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5731.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 125822 + ... + 126342.

Almost surely, 2^65688722 is an apocalyptic number.

65688722 is a deficient number, since it is larger than the sum of its proper divisors (42824515).

65688722 is an equidigital number, since it uses as much as digits as its factorization.

65688722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066 (or 534 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 65688722 is about 8104.8579259602. The cubic root of 65688722 is about 403.4876727970.

The spelling of 65688722 in words is "sixty-five million, six hundred eighty-eight thousand, seven hundred twenty-two".