640321034 has 4 divisors (see below), whose sum is σ = 960481554. Its totient is φ = 320160516.

The previous prime is 640321009. The next prime is 640321039. The reversal of 640321034 is 430123046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 625150009 + 15171025 = 25003^2 + 3895^2 .

It is a super-2 number, since 2×640321034² = 820022053165658312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640321039) 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 as a sum of consecutive naturals, namely, 160080257 + ... + 160080260.

Almost surely, 2^640321034 is an apocalyptic number.

640321034 is a deficient number, since it is larger than the sum of its proper divisors (320160520).

640321034 is a wasteful number, since it uses less digits than its factorization.

640321034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320160519.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 640321034 is about 25304.5654773995. The cubic root of 640321034 is about 861.9179450068.

The spelling of 640321034 in words is "six hundred forty million, three hundred twenty-one thousand, thirty-four".