64704247 has 2 divisors, whose sum is σ = 64704248. Its totient is φ = 64704246.

The previous prime is 64704197. The next prime is 64704257. The reversal of 64704247 is 74240746.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64704247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64704257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32352123 + 32352124.

It is an arithmetic number, because the mean of its divisors is an integer number (32352124).

Almost surely, 2^64704247 is an apocalyptic number.

64704247 is a deficient number, since it is larger than the sum of its proper divisors (1).

64704247 is an equidigital number, since it uses as much as digits as its factorization.

64704247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 64704247 is about 8043.8950142328. The cubic root of 64704247 is about 401.4618323573.

The spelling of 64704247 in words is "sixty-four million, seven hundred four thousand, two hundred forty-seven".