642733644 has 24 divisors (see below), whose sum is σ = 1713956608. Its totient is φ = 183638160.

The previous prime is 642733639. The next prime is 642733661. The reversal of 642733644 is 446337246.

642733644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3825712 + ... + 3825879.

Almost surely, 2^642733644 is an apocalyptic number.

It is an amenable number.

642733644 is an abundant number, since it is smaller than the sum of its proper divisors (1071222964).

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

642733644 is a wasteful number, since it uses less digits than its factorization.

642733644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651605 (or 7651603 counting only the distinct ones).

The product of its digits is 290304, while the sum is 39.

The square root of 642733644 is about 25352.1920945704. The cubic root of 642733644 is about 862.9991035242. Note that the first 3 decimals are identical.

The spelling of 642733644 in words is "six hundred forty-two million, seven hundred thirty-three thousand, six hundred forty-four".