64708216478640 has 320 divisors, whose sum is σ = 259530531840000. Its totient is φ = 14511384216576.

The previous prime is 64708216478639. The next prime is 64708216478651. The reversal of 64708216478640 is 4687461280746.

64708216478640 is a `hidden beast` number, since 6 + 4 + 70 + 82 + 16 + 478 + 6 + 4 + 0 = 666.

64708216478640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39572640 + ... + 41175359.

It is an arithmetic number, because the mean of its divisors is an integer number (811032912000).

Almost surely, 2^{64708216478640} is an apocalyptic number.

64708216478640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64708216478640 is an abundant number, since it is smaller than the sum of its proper divisors (194822315361360).

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

64708216478640 is a wasteful number, since it uses less digits than its factorization.

64708216478640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80748081 (or 80748069 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 63.

The spelling of 64708216478640 in words is "sixty-four trillion, seven hundred eight billion, two hundred sixteen million, four hundred seventy-eight thousand, six hundred forty".