642042212 has 48 divisors (see below), whose sum is σ = 1316165760. Its totient is φ = 268349952.

The previous prime is 642042197. The next prime is 642042221. The reversal of 642042212 is 212240246.

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, 264428 + ... + 266844.

It is an arithmetic number, because the mean of its divisors is an integer number (27420120).

Almost surely, 2^642042212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642042212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (658082880).

642042212 is an abundant number, since it is smaller than the sum of its proper divisors (674123548).

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

642042212 is a wasteful number, since it uses less digits than its factorization.

642042212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 642042212 is about 25338.5518923241. The cubic root of 642042212 is about 862.6895303432.

Adding to 642042212 its reverse (212240246), we get a palindrome (854282458).

The spelling of 642042212 in words is "six hundred forty-two million, forty-two thousand, two hundred twelve".