64728871 has 4 divisors (see below), whose sum is σ = 64843200. Its totient is φ = 64614544.

The previous prime is 64728863. The next prime is 64728883. The reversal of 64728871 is 17882746.

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 64728871 - 2³ = 64728863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64728971) 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, 56311 + ... + 57448.

It is an arithmetic number, because the mean of its divisors is an integer number (16210800).

Almost surely, 2^64728871 is an apocalyptic number.

64728871 is a deficient number, since it is larger than the sum of its proper divisors (114329).

64728871 is a wasteful number, since it uses less digits than its factorization.

64728871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114328.

The product of its digits is 150528, while the sum is 43.

The square root of 64728871 is about 8045.4254704148. The cubic root of 64728871 is about 401.5127529839.

The spelling of 64728871 in words is "sixty-four million, seven hundred twenty-eight thousand, eight hundred seventy-one".