640586522 has 4 divisors (see below), whose sum is σ = 960879786. Its totient is φ = 320293260.

The previous prime is 640586477. The next prime is 640586543. The reversal of 640586522 is 225685046.

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., 406465921 + 234120601 = 20161^2 + 15301^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160146629 + ... + 160146632.

Almost surely, 2^640586522 is an apocalyptic number.

640586522 is a deficient number, since it is larger than the sum of its proper divisors (320293264).

640586522 is a wasteful number, since it uses less digits than its factorization.

640586522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320293263.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 640586522 is about 25309.8107855432. The cubic root of 640586522 is about 862.0370504977.

The spelling of 640586522 in words is "six hundred forty million, five hundred eighty-six thousand, five hundred twenty-two".