640327442 has 16 divisors (see below), whose sum is σ = 976500672. Its totient is φ = 314843760.

The previous prime is 640327357. The next prime is 640327447. The reversal of 640327442 is 244723046.

It is a junction number, because it is equal to n+sod(n) for n = 640327399 and 640327408.

It is not an unprimeable number, because it can be changed into a prime (640327447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80768 + ... + 88340.

It is an arithmetic number, because the mean of its divisors is an integer number (61031292).

Almost surely, 2^640327442 is an apocalyptic number.

640327442 is a deficient number, since it is larger than the sum of its proper divisors (336173230).

640327442 is a wasteful number, since it uses less digits than its factorization.

640327442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273.

The product of its (nonzero) digits is 32256, while the sum is 32.

The square root of 640327442 is about 25304.6920945504. The cubic root of 640327442 is about 861.9208202061.

The spelling of 640327442 in words is "six hundred forty million, three hundred twenty-seven thousand, four hundred forty-two".