642943680 has 56 divisors (see below), whose sum is σ = 2041349232. Its totient is φ = 171451392.

The previous prime is 642943667. The next prime is 642943681. The reversal of 642943680 is 86349246.

It is a happy number.

It is a super-3 number, since 3×642943680³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (642943681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333907 + ... + 335826.

Almost surely, 2^642943680 is an apocalyptic number.

642943680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642943680 is an abundant number, since it is smaller than the sum of its proper divisors (1398405552).

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

642943680 is a wasteful number, since it uses less digits than its factorization.

642943680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669753 (or 669743 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 642943680 is about 25356.3341198999. The cubic root of 642943680 is about 863.0930984683.

The spelling of 642943680 in words is "six hundred forty-two million, nine hundred forty-three thousand, six hundred eighty".