640567361 has 8 divisors (see below), whose sum is σ = 775140480. Its totient is φ = 516760128.

The previous prime is 640567331. The next prime is 640567363. The reversal of 640567361 is 163765046.

It is a happy number.

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 640567361 - 2⁶ = 640567297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640567363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691341 + ... + 2691578.

It is an arithmetic number, because the mean of its divisors is an integer number (96892560).

Almost surely, 2^640567361 is an apocalyptic number.

It is an amenable number.

640567361 is a deficient number, since it is larger than the sum of its proper divisors (134573119).

640567361 is a wasteful number, since it uses less digits than its factorization.

640567361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382943.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 640567361 is about 25309.4322536085. The cubic root of 640567361 is about 862.0284554284.

It can be divided in two parts, 64056 and 7361, that added together give a palindrome (71417).

The spelling of 640567361 in words is "six hundred forty million, five hundred sixty-seven thousand, three hundred sixty-one".