640386575744 has 32 divisors (see below), whose sum is σ = 1275948987600. Its totient is φ = 320148398592.

The previous prime is 640386575659. The next prime is 640386575749. The reversal of 640386575744 is 447575683046.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640386575749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575402 + ... + 1269590.

Almost surely, 2^640386575744 is an apocalyptic number.

640386575744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

640386575744 is a deficient number, since it is larger than the sum of its proper divisors (635562411856).

640386575744 is an equidigital number, since it uses as much as digits as its factorization.

640386575744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701410 (or 701398 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 59.

The spelling of 640386575744 in words is "six hundred forty billion, three hundred eighty-six million, five hundred seventy-five thousand, seven hundred forty-four".