64785256734 has 16 divisors (see below), whose sum is σ = 141349651200. Its totient is φ = 19631895960.

The previous prime is 64785256709. The next prime is 64785256771. The reversal of 64785256734 is 43765258746.

It is a happy number.

It is a Curzon number.

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, 490797334 + ... + 490797465.

It is an arithmetic number, because the mean of its divisors is an integer number (8834353200).

Almost surely, 2^64785256734 is an apocalyptic number.

64785256734 is an abundant number, since it is smaller than the sum of its proper divisors (76564394466).

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

64785256734 is a wasteful number, since it uses less digits than its factorization.

64785256734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981594815.

The product of its digits is 33868800, while the sum is 57.

The spelling of 64785256734 in words is "sixty-four billion, seven hundred eighty-five million, two hundred fifty-six thousand, seven hundred thirty-four".