64704233664 has 672 divisors, whose sum is σ = 238215684096. Its totient is φ = 16363192320.

The previous prime is 64704233663. The next prime is 64704233669. The reversal of 64704233664 is 46633240746.

It is a tau number, because it is divible by the number of its divisors (672).

It is not an unprimeable number, because it can be changed into a prime (64704233663) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 78619557 + ... + 78620379.

Almost surely, 2^64704233664 is an apocalyptic number.

64704233664 is a gapful number since it is divisible by the number (64) 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 64704233664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119107842048).

64704233664 is an abundant number, since it is smaller than the sum of its proper divisors (173511450432).

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

64704233664 is a wasteful number, since it uses less digits than its factorization.

64704233664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 45.

The spelling of 64704233664 in words is "sixty-four billion, seven hundred four million, two hundred thirty-three thousand, six hundred sixty-four".