640346534 has 8 divisors (see below), whose sum is σ = 960858720. Its totient is φ = 320060296.

The previous prime is 640346533. The next prime is 640346549. The reversal of 640346534 is 435643046.

640346534 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 junction number, because it is equal to n+sod(n) for n = 640346494 and 640346503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640346533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49214 + ... + 60849.

It is an arithmetic number, because the mean of its divisors is an integer number (120107340).

Almost surely, 2^640346534 is an apocalyptic number.

640346534 is a deficient number, since it is larger than the sum of its proper divisors (320512186).

640346534 is a wasteful number, since it uses less digits than its factorization.

640346534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112974.

The product of its (nonzero) digits is 103680, while the sum is 35.

The square root of 640346534 is about 25305.0693340287. The cubic root of 640346534 is about 861.9293864634.

The spelling of 640346534 in words is "six hundred forty million, three hundred forty-six thousand, five hundred thirty-four".