60669721 has 4 divisors (see below), whose sum is σ = 69336832. Its totient is φ = 52002612.

The previous prime is 60669703. The next prime is 60669731. The reversal of 60669721 is 12796606.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12796606 = 2 ⋅6398303.

It is a cyclic number.

It is not a de Polignac number, because 60669721 - 2¹³ = 60661529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60669731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4333545 + ... + 4333558.

It is an arithmetic number, because the mean of its divisors is an integer number (17334208).

Almost surely, 2^60669721 is an apocalyptic number.

It is an amenable number.

60669721 is a deficient number, since it is larger than the sum of its proper divisors (8667111).

60669721 is an equidigital number, since it uses as much as digits as its factorization.

60669721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8667110.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 60669721 is about 7789.0770313305. The cubic root of 60669721 is about 392.9379718959.

The spelling of 60669721 in words is "sixty million, six hundred sixty-nine thousand, seven hundred twenty-one".