64528668864 has 336 divisors, whose sum is σ = 206407597344. Its totient is φ = 19269550080.

The previous prime is 64528668839. The next prime is 64528668881. The reversal of 64528668864 is 46886682546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55965312 + ... + 55966464.

Almost surely, 2^64528668864 is an apocalyptic number.

64528668864 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 64528668864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103203798672).

64528668864 is an abundant number, since it is smaller than the sum of its proper divisors (141878928480).

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

64528668864 is a wasteful number, since it uses less digits than its factorization.

64528668864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1242 counting only the distinct ones).

The product of its digits is 106168320, while the sum is 63.

The spelling of 64528668864 in words is "sixty-four billion, five hundred twenty-eight million, six hundred sixty-eight thousand, eight hundred sixty-four".