643252050 has 192 divisors, whose sum is σ = 2074152960. Its totient is φ = 143519040.

The previous prime is 643252037. The next prime is 643252081. The reversal of 643252050 is 50252346.

643252050 is a `hidden beast` number, since 64 + 32 + 520 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 405559 + ... + 407141.

It is an arithmetic number, because the mean of its divisors is an integer number (10802880).

Almost surely, 2^643252050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643252050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1037076480).

643252050 is an abundant number, since it is smaller than the sum of its proper divisors (1430900910).

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

643252050 is a wasteful number, since it uses less digits than its factorization.

643252050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654 (or 1643 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 643252050 is about 25362.4141201109. The cubic root of 643252050 is about 863.2310625895.

The spelling of 643252050 in words is "six hundred forty-three million, two hundred fifty-two thousand, fifty".