64394887392 has 288 divisors, whose sum is σ = 207957335040. Its totient is φ = 18880646400.

The previous prime is 64394887391. The next prime is 64394887439. The reversal of 64394887392 is 29378849346.

64394887392 is a `hidden beast` number, since 6 + 439 + 48 + 8 + 73 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64394887391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11880459 + ... + 11885877.

It is an arithmetic number, because the mean of its divisors is an integer number (722074080).

Almost surely, 2^64394887392 is an apocalyptic number.

64394887392 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64394887392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103978667520).

64394887392 is an abundant number, since it is smaller than the sum of its proper divisors (143562447648).

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

64394887392 is a wasteful number, since it uses less digits than its factorization.

64394887392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499 (or 5466 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 64394887392 in words is "sixty-four billion, three hundred ninety-four million, eight hundred eighty-seven thousand, three hundred ninety-two".