642022660 has 48 divisors (see below), whose sum is σ = 1384931520. Its totient is φ = 249910400.

The previous prime is 642022643. The next prime is 642022669. The reversal of 642022660 is 66220246.

It is not an unprimeable number, because it can be changed into a prime (642022669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116487 + ... + 121873.

It is an arithmetic number, because the mean of its divisors is an integer number (28852740).

Almost surely, 2^642022660 is an apocalyptic number.

It is an amenable number.

642022660 is an abundant number, since it is smaller than the sum of its proper divisors (742908860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642022660 is a wasteful number, since it uses less digits than its factorization.

642022660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556 (or 5554 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 642022660 is about 25338.1660741262. The cubic root of 642022660 is about 862.6807731428.

The spelling of 642022660 in words is "six hundred forty-two million, twenty-two thousand, six hundred sixty".