64678974528 has 168 divisors, whose sum is σ = 200640525312. Its totient is φ = 18333858816.

The previous prime is 64678974497. The next prime is 64678974533. The reversal of 64678974528 is 82547987646.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (168).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1167750 + ... + 1221882.

Almost surely, 2^64678974528 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 64678974528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100320262656).

64678974528 is an abundant number, since it is smaller than the sum of its proper divisors (135961550784).

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

64678974528 is a wasteful number, since it uses less digits than its factorization.

64678974528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54289 (or 54272 counting only the distinct ones).

The product of its digits is 162570240, while the sum is 66.

The spelling of 64678974528 in words is "sixty-four billion, six hundred seventy-eight million, nine hundred seventy-four thousand, five hundred twenty-eight".