64638784276338 has 64 divisors (see below), whose sum is σ = 137949943541760. Its totient is φ = 20132020672128.

The previous prime is 64638784276321. The next prime is 64638784276369. The reversal of 64638784276338 is 83367248783646.

It is a self number, because there is not a number n which added to its sum of digits gives 64638784276338.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 332641395 + ... + 332835657.

It is an arithmetic number, because the mean of its divisors is an integer number (2155467867840).

Almost surely, 2^{64638784276338} is an apocalyptic number.

64638784276338 is an abundant number, since it is smaller than the sum of its proper divisors (73311159265422).

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

64638784276338 is a wasteful number, since it uses less digits than its factorization.

64638784276338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234343.

The product of its digits is 4682022912, while the sum is 75.

The spelling of 64638784276338 in words is "sixty-four trillion, six hundred thirty-eight billion, seven hundred eighty-four million, two hundred seventy-six thousand, three hundred thirty-eight".