64378586438 has 16 divisors (see below), whose sum is σ = 98747223120. Its totient is φ = 31468874400.

The previous prime is 64378586431. The next prime is 64378586477. The reversal of 64378586438 is 83468587346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64378586431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1485773 + ... + 1528488.

It is an arithmetic number, because the mean of its divisors is an integer number (6171701445).

Almost surely, 2^64378586438 is an apocalyptic number.

64378586438 is a deficient number, since it is larger than the sum of its proper divisors (34368636682).

64378586438 is a wasteful number, since it uses less digits than its factorization.

64378586438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014503.

The product of its digits is 92897280, while the sum is 62.

The spelling of 64378586438 in words is "sixty-four billion, three hundred seventy-eight million, five hundred eighty-six thousand, four hundred thirty-eight".