64728247 has 2 divisors, whose sum is σ = 64728248. Its totient is φ = 64728246.

The previous prime is 64728241. The next prime is 64728263. The reversal of 64728247 is 74282746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64728247 - 2¹¹ = 64726199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64728241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32364123 + 32364124.

It is an arithmetic number, because the mean of its divisors is an integer number (32364124).

Almost surely, 2^64728247 is an apocalyptic number.

64728247 is a deficient number, since it is larger than the sum of its proper divisors (1).

64728247 is an equidigital number, since it uses as much as digits as its factorization.

64728247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 40.

The square root of 64728247 is about 8045.3866905202. The cubic root of 64728247 is about 401.5114627572.

The spelling of 64728247 in words is "sixty-four million, seven hundred twenty-eight thousand, two hundred forty-seven".