640295342 has 8 divisors (see below), whose sum is σ = 961235856. Its totient is φ = 319883392.

The previous prime is 640295339. The next prime is 640295353. The reversal of 640295342 is 243592046.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129098 + ... + 133965.

It is an arithmetic number, because the mean of its divisors is an integer number (120154482).

Almost surely, 2^640295342 is an apocalyptic number.

640295342 is a deficient number, since it is larger than the sum of its proper divisors (320940514).

640295342 is a wasteful number, since it uses less digits than its factorization.

640295342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264282.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 640295342 is about 25304.0578168799. The cubic root of 640295342 is about 861.9064170956.

The spelling of 640295342 in words is "six hundred forty million, two hundred ninety-five thousand, three hundred forty-two".