64571894432 has 24 divisors (see below), whose sum is σ = 130561755156. Its totient is φ = 31413353472.

The previous prime is 64571894419. The next prime is 64571894449. The reversal of 64571894432 is 23449817546.

It can be written as a sum of positive squares in 2 ways, for example, as 57563525776 + 7008368656 = 239924^2 + 83716^2 .

It is a super-4 number, since 4×64571894432⁴ (a number of 44 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27267353 + ... + 27269720.

Almost surely, 2^64571894432 is an apocalyptic number.

It is an amenable number.

64571894432 is an abundant number, since it is smaller than the sum of its proper divisors (65989860724).

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

64571894432 is a wasteful number, since it uses less digits than its factorization.

64571894432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54537120 (or 54537112 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

The spelling of 64571894432 in words is "sixty-four billion, five hundred seventy-one million, eight hundred ninety-four thousand, four hundred thirty-two".