642360212 has 36 divisors (see below), whose sum is σ = 1240289820. Its totient is φ = 290863872.

The previous prime is 642360209. The next prime is 642360223. The reversal of 642360212 is 212063246.

It can be written as a sum of positive squares in 6 ways, for example, as 39363076 + 602997136 = 6274^2 + 24556^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26864 + ... + 44792.

It is an arithmetic number, because the mean of its divisors is an integer number (34452495).

Almost surely, 2^642360212 is an apocalyptic number.

It is an amenable number.

642360212 is a deficient number, since it is larger than the sum of its proper divisors (597929608).

642360212 is a wasteful number, since it uses less digits than its factorization.

642360212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18012 (or 17997 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 642360212 is about 25344.8261386816. The cubic root of 642360212 is about 862.8319353055.

The spelling of 642360212 in words is "six hundred forty-two million, three hundred sixty thousand, two hundred twelve".