64720471 has 2 divisors, whose sum is σ = 64720472. Its totient is φ = 64720470.

The previous prime is 64720423. The next prime is 64720531. The reversal of 64720471 is 17402746.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64720471 is a prime.

It is a super-3 number, since 3×64720471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64720421) 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 as a sum of consecutive naturals, namely, 32360235 + 32360236.

It is an arithmetic number, because the mean of its divisors is an integer number (32360236).

Almost surely, 2^64720471 is an apocalyptic number.

64720471 is a deficient number, since it is larger than the sum of its proper divisors (1).

64720471 is an equidigital number, since it uses as much as digits as its factorization.

64720471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 64720471 is about 8044.9034176925. The cubic root of 64720471 is about 401.4953838513.

The spelling of 64720471 in words is "sixty-four million, seven hundred twenty thousand, four hundred seventy-one".