64138973484 has 12 divisors (see below), whose sum is σ = 149657604824. Its totient is φ = 21379657824.

The previous prime is 64138973467. The next prime is 64138973497. The reversal of 64138973484 is 48437983146.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×64138973484² (a number of 22 digits) contains 22 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, 2672457217 + ... + 2672457240.

Almost surely, 2^64138973484 is an apocalyptic number.

It is an amenable number.

64138973484 is an abundant number, since it is smaller than the sum of its proper divisors (85518631340).

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

64138973484 is a wasteful number, since it uses less digits than its factorization.

64138973484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344914464 (or 5344914462 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 57.

The spelling of 64138973484 in words is "sixty-four billion, one hundred thirty-eight million, nine hundred seventy-three thousand, four hundred eighty-four".