640545146 has 8 divisors (see below), whose sum is σ = 961910964. Its totient is φ = 319908160.

The previous prime is 640545109. The next prime is 640545151. The reversal of 640545146 is 641545046.

It can be written as a sum of positive squares in 2 ways, for example, as 635594521 + 4950625 = 25211^2 + 2225^2 .

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

It is a super-3 number, since 3×640545146³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180005 + ... + 183528.

Almost surely, 2^640545146 is an apocalyptic number.

640545146 is a deficient number, since it is larger than the sum of its proper divisors (321365818).

640545146 is a wasteful number, since it uses less digits than its factorization.

640545146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364416.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 640545146 is about 25308.9933818001. The cubic root of 640545146 is about 862.0184902087.

The spelling of 640545146 in words is "six hundred forty million, five hundred forty-five thousand, one hundred forty-six".