640413285436 has 24 divisors (see below), whose sum is σ = 1150456368320. Its totient is φ = 311822514432.

The previous prime is 640413285419. The next prime is 640413285437. The reversal of 640413285436 is 634582314046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640413285437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13857921 + ... + 13904056.

Almost surely, 2^640413285436 is an apocalyptic number.

It is an amenable number.

640413285436 is a deficient number, since it is larger than the sum of its proper divisors (510043082884).

640413285436 is a wasteful number, since it uses less digits than its factorization.

640413285436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27762133 (or 27762131 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 640413285436 in words is "six hundred forty billion, four hundred thirteen million, two hundred eighty-five thousand, four hundred thirty-six".