640328522 has 4 divisors (see below), whose sum is σ = 960492786. Its totient is φ = 320164260.

The previous prime is 640328509. The next prime is 640328531. The reversal of 640328522 is 225823046.

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., 635997961 + 4330561 = 25219^2 + 2081^2 .

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 as a sum of consecutive naturals, namely, 160082129 + ... + 160082132.

Almost surely, 2^640328522 is an apocalyptic number.

640328522 is a deficient number, since it is larger than the sum of its proper divisors (320164264).

640328522 is a wasteful number, since it uses less digits than its factorization.

640328522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320164263.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 640328522 is about 25304.7134344572. The cubic root of 640328522 is about 861.9213047884.

The spelling of 640328522 in words is "six hundred forty million, three hundred twenty-eight thousand, five hundred twenty-two".