64686983478 has 16 divisors (see below), whose sum is σ = 139325810736. Its totient is φ = 19903687200.

The previous prime is 64686983419. The next prime is 64686983503. The reversal of 64686983478 is 87438968646.

64686983478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414660073 + ... + 414660228.

It is an arithmetic number, because the mean of its divisors is an integer number (8707863171).

Almost surely, 2^64686983478 is an apocalyptic number.

64686983478 is an abundant number, since it is smaller than the sum of its proper divisors (74638827258).

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

64686983478 is a wasteful number, since it uses less digits than its factorization.

64686983478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829320319.

The product of its digits is 334430208, while the sum is 69.

The spelling of 64686983478 in words is "sixty-four billion, six hundred eighty-six million, nine hundred eighty-three thousand, four hundred seventy-eight".