642280664 has 16 divisors (see below), whose sum is σ = 1211490000. Its totient is φ = 319216672.

The previous prime is 642280663. The next prime is 642280679. The reversal of 642280664 is 466082246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642280663) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 239039 + ... + 241710.

It is an arithmetic number, because the mean of its divisors is an integer number (75718125).

Almost surely, 2^642280664 is an apocalyptic number.

It is an amenable number.

642280664 is a deficient number, since it is larger than the sum of its proper divisors (569209336).

642280664 is a wasteful number, since it uses less digits than its factorization.

642280664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480922 (or 480918 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 642280664 is about 25343.2567757185. The cubic root of 642280664 is about 862.7963169785.

The spelling of 642280664 in words is "six hundred forty-two million, two hundred eighty thousand, six hundred sixty-four".