642021300 has 54 divisors (see below), whose sum is σ = 2012382918. Its totient is φ = 171205440.

The previous prime is 642021251. The next prime is 642021329. The reversal of 642021300 is 3120246.

It is a happy number.

642021300 is a `hidden beast` number, since 642 + 0 + 21 + 3 + 0 + 0 = 666.

642021300 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 7056 + 642014244 = 84^2 + 25338^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 355779 + ... + 357578.

Almost surely, 2^642021300 is an apocalyptic number.

642021300 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642021300 is an abundant number, since it is smaller than the sum of its proper divisors (1370361618).

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

642021300 is a wasteful number, since it uses less digits than its factorization.

642021300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713377 (or 713367 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 642021300 is about 25338.1392371263. The cubic root of 642021300 is about 862.6801640020.

Adding to 642021300 its reverse (3120246), we get a palindrome (645141546).

The spelling of 642021300 in words is "six hundred forty-two million, twenty-one thousand, three hundred".