640196379 has 24 divisors (see below), whose sum is σ = 960406720. Its totient is φ = 426161736.

The previous prime is 640196377. The next prime is 640196429. The reversal of 640196379 is 973691046.

640196379 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 9 + 637 + 9 = 666.

640196379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640196379 - 2¹ = 640196377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640196371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207204 + ... + 210270.

Almost surely, 2^640196379 is an apocalyptic number.

640196379 is a deficient number, since it is larger than the sum of its proper divisors (320210341).

640196379 is an equidigital number, since it uses as much as digits as its factorization.

640196379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3929 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 640196379 is about 25302.1022644364. The cubic root of 640196379 is about 861.8620098594.

The spelling of 640196379 in words is "six hundred forty million, one hundred ninety-six thousand, three hundred seventy-nine".