64687678646 has 8 divisors (see below), whose sum is σ = 97149707424. Its totient is φ = 32304442840.

The previous prime is 64687678633. The next prime is 64687678651.

64687678646 is nontrivially palindromic in base 10.

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

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, 19696190 + ... + 19699473.

It is an arithmetic number, because the mean of its divisors is an integer number (12143713428).

Almost surely, 2^64687678646 is an apocalyptic number.

64687678646 is a deficient number, since it is larger than the sum of its proper divisors (32462028778).

64687678646 is a wasteful number, since it uses less digits than its factorization.

64687678646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39396486.

The product of its digits is 390168576, while the sum is 68.

The spelling of 64687678646 in words is "sixty-four billion, six hundred eighty-seven million, six hundred seventy-eight thousand, six hundred forty-six".