640246367 has 8 divisors (see below), whose sum is σ = 680550336. Its totient is φ = 600236032.

The previous prime is 640246319. The next prime is 640246391. The reversal of 640246367 is 763642046.

640246367 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 a cyclic number.

It is not a de Polignac number, because 640246367 - 2²⁴ = 623469151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640246367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640246067) 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, 68903 + ... + 77640.

It is an arithmetic number, because the mean of its divisors is an integer number (85068792).

Almost surely, 2^640246367 is an apocalyptic number.

640246367 is a deficient number, since it is larger than the sum of its proper divisors (40303969).

640246367 is a wasteful number, since it uses less digits than its factorization.

640246367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146817.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 640246367 is about 25303.0900682110. The cubic root of 640246367 is about 861.8844413290.

The spelling of 640246367 in words is "six hundred forty million, two hundred forty-six thousand, three hundred sixty-seven".