642143250 has 96 divisors (see below), whose sum is σ = 1984454784. Its totient is φ = 146772000.

The previous prime is 642143239. The next prime is 642143287. The reversal of 642143250 is 52341246.

642143250 is a `hidden beast` number, since 642 + 14 + 3 + 2 + 5 + 0 = 666.

642143250 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 4636 + ... + 36135.

It is an arithmetic number, because the mean of its divisors is an integer number (20671404).

Almost surely, 2^642143250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642143250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992227392).

642143250 is an abundant number, since it is smaller than the sum of its proper divisors (1342311534).

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

642143250 is a wasteful number, since it uses less digits than its factorization.

642143250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40801 (or 40788 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 642143250 is about 25340.5455742373. The cubic root of 642143250 is about 862.7347817048.

Adding to 642143250 its reverse (52341246), we get a palindrome (694484496).

The spelling of 642143250 in words is "six hundred forty-two million, one hundred forty-three thousand, two hundred fifty".