64728271 has 4 divisors (see below), whose sum is σ = 64816600. Its totient is φ = 64639944.

The previous prime is 64728263. The next prime is 64728283. The reversal of 64728271 is 17282746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64728271 - 2³ = 64728263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64728271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64728241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43056 + ... + 44533.

It is an arithmetic number, because the mean of its divisors is an integer number (16204150).

Almost surely, 2^64728271 is an apocalyptic number.

64728271 is a deficient number, since it is larger than the sum of its proper divisors (88329).

64728271 is an equidigital number, since it uses as much as digits as its factorization.

64728271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88328.

The product of its digits is 37632, while the sum is 37.

The square root of 64728271 is about 8045.3881820581. The cubic root of 64728271 is about 401.5115123814.

The spelling of 64728271 in words is "sixty-four million, seven hundred twenty-eight thousand, two hundred seventy-one".