642142140 has 48 divisors (see below), whose sum is σ = 1805956992. Its totient is φ = 170479936.

The previous prime is 642142097. The next prime is 642142169. The reversal of 642142140 is 41241246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642142140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9954 + ... + 37193.

It is an arithmetic number, because the mean of its divisors is an integer number (37624104).

Almost surely, 2^642142140 is an apocalyptic number.

642142140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642142140 is an abundant number, since it is smaller than the sum of its proper divisors (1163814852).

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

642142140 is a wasteful number, since it uses less digits than its factorization.

642142140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47386 (or 47384 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 642142140 is about 25340.5236725684. The cubic root of 642142140 is about 862.7342846007.

Adding to 642142140 its reverse (41241246), we get a palindrome (683383386).

The spelling of 642142140 in words is "six hundred forty-two million, one hundred forty-two thousand, one hundred forty".