64878434446 has 8 divisors (see below), whose sum is σ = 111220173360. Its totient is φ = 27805043328.

The previous prime is 64878434419. The next prime is 64878434459. The reversal of 64878434446 is 64443487846.

It is a happy number.

64878434446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64878434446² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 2317086931 + ... + 2317086958.

It is an arithmetic number, because the mean of its divisors is an integer number (13902521670).

Almost surely, 2^64878434446 is an apocalyptic number.

64878434446 is a deficient number, since it is larger than the sum of its proper divisors (46341738914).

64878434446 is a wasteful number, since it uses less digits than its factorization.

64878434446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4634173898.

The product of its digits is 49545216, while the sum is 58.

The spelling of 64878434446 in words is "sixty-four billion, eight hundred seventy-eight million, four hundred thirty-four thousand, four hundred forty-six".