64318326728 has 64 divisors (see below), whose sum is σ = 129515760000. Its totient is φ = 29837693952.

The previous prime is 64318326703. The next prime is 64318326731. The reversal of 64318326728 is 82762381346.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2939075 + ... + 2960877.

It is an arithmetic number, because the mean of its divisors is an integer number (2023683750).

Almost surely, 2^64318326728 is an apocalyptic number.

64318326728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

64318326728 is an abundant number, since it is smaller than the sum of its proper divisors (65197433272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64318326728 is a wasteful number, since it uses less digits than its factorization.

64318326728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22134 (or 22130 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 50.

The spelling of 64318326728 in words is "sixty-four billion, three hundred eighteen million, three hundred twenty-six thousand, seven hundred twenty-eight".