64728727833 has 64 divisors (see below), whose sum is σ = 109693108224. Its totient is φ = 32976552000.

The previous prime is 64728727769. The next prime is 64728727933. The reversal of 64728727833 is 33872782746.

It is not a de Polignac number, because 64728727833 - 2⁶ = 64728727769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64728727333) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3122260 + ... + 3142922.

It is an arithmetic number, because the mean of its divisors is an integer number (1713954816).

Almost surely, 2^64728727833 is an apocalyptic number.

It is an amenable number.

64728727833 is a deficient number, since it is larger than the sum of its proper divisors (44964380391).

64728727833 is a wasteful number, since it uses less digits than its factorization.

64728727833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20946.

The product of its digits is 18966528, while the sum is 57.

The spelling of 64728727833 in words is "sixty-four billion, seven hundred twenty-eight million, seven hundred twenty-seven thousand, eight hundred thirty-three".