64820781792 has 96 divisors (see below), whose sum is σ = 203603772960. Its totient is φ = 19944852480.

The previous prime is 64820781749. The next prime is 64820781827. The reversal of 64820781792 is 29718702846.

It is a happy number.

64820781792 is a `hidden beast` number, since 6 + 482 + 0 + 78 + 1 + 7 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2874309 + ... + 2896772.

It is an arithmetic number, because the mean of its divisors is an integer number (2120872635).

Almost surely, 2^64820781792 is an apocalyptic number.

It is an amenable number.

64820781792 is an abundant number, since it is smaller than the sum of its proper divisors (138782991168).

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

64820781792 is a wasteful number, since it uses less digits than its factorization.

64820781792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771113 (or 5771099 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 64820781792 in words is "sixty-four billion, eight hundred twenty million, seven hundred eighty-one thousand, seven hundred ninety-two".