64734856992 has 384 divisors, whose sum is σ = 211315910400. Its totient is φ = 19143032832.

The previous prime is 64734856987. The next prime is 64734857009. The reversal of 64734856992 is 29965843746.

64734856992 is a `hidden beast` number, since 6 + 4 + 7 + 3 + 485 + 69 + 92 = 666.

64734856992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114981703 + ... + 114982265.

It is an arithmetic number, because the mean of its divisors is an integer number (550301850).

Almost surely, 2^64734856992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64734856992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105657955200).

64734856992 is an abundant number, since it is smaller than the sum of its proper divisors (146581053408).

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

64734856992 is a wasteful number, since it uses less digits than its factorization.

64734856992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 963 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 63.

The spelling of 64734856992 in words is "sixty-four billion, seven hundred thirty-four million, eight hundred fifty-six thousand, nine hundred ninety-two".