640378059 has 8 divisors (see below), whose sum is σ = 873694272. Its totient is φ = 416990280.

The previous prime is 640378021. The next prime is 640378073. The reversal of 640378059 is 950873046.

It is a happy number.

640378059 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640378059 - 2¹⁶ = 640312523 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 640378059.

It is not an unprimeable number, because it can be changed into a prime (640378009) 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, 2481957 + ... + 2482214.

It is an arithmetic number, because the mean of its divisors is an integer number (109211784).

Almost surely, 2^640378059 is an apocalyptic number.

640378059 is a deficient number, since it is larger than the sum of its proper divisors (233316213).

640378059 is a wasteful number, since it uses less digits than its factorization.

640378059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964217.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 640378059 is about 25305.6922252682. The cubic root of 640378059 is about 861.9435308246.

The spelling of 640378059 in words is "six hundred forty million, three hundred seventy-eight thousand, fifty-nine".