60646721 has 4 divisors (see below), whose sum is σ = 61477572. Its totient is φ = 59815872.

The previous prime is 60646711. The next prime is 60646723. The reversal of 60646721 is 12764606.

60646721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12764606 = 2 ⋅6382303.

It can be written as a sum of positive squares in 2 ways, for example, as 27457600 + 33189121 = 5240^2 + 5761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-60646721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60646723) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 415316 + ... + 415461.

It is an arithmetic number, because the mean of its divisors is an integer number (15369393).

Almost surely, 2^60646721 is an apocalyptic number.

It is an amenable number.

60646721 is a deficient number, since it is larger than the sum of its proper divisors (830851).

60646721 is an equidigital number, since it uses as much as digits as its factorization.

60646721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830850.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 60646721 is about 7787.6004648415. The cubic root of 60646721 is about 392.8883111233. Note that the first 3 decimals are identical.

The spelling of 60646721 in words is "sixty million, six hundred forty-six thousand, seven hundred twenty-one".