64127728478 has 24 divisors (see below), whose sum is σ = 108679582440. Its totient is φ = 28143822560.

The previous prime is 64127728459. The next prime is 64127728481. The reversal of 64127728478 is 87482772146.

It is a super-2 number, since 2×64127728478² (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 11 ways as a sum of consecutive naturals, for example, 1714493 + ... + 1751496.

It is an arithmetic number, because the mean of its divisors is an integer number (4528315935).

Almost surely, 2^64127728478 is an apocalyptic number.

64127728478 is a deficient number, since it is larger than the sum of its proper divisors (44551853962).

64127728478 is a wasteful number, since it uses less digits than its factorization.

64127728478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466060 (or 3466031 counting only the distinct ones).

The product of its digits is 8429568, while the sum is 56.

The spelling of 64127728478 in words is "sixty-four billion, one hundred twenty-seven million, seven hundred twenty-eight thousand, four hundred seventy-eight".