644152050 has 36 divisors (see below), whose sum is σ = 1730623050. Its totient is φ = 171773760.

The previous prime is 644152037. The next prime is 644152051. The reversal of 644152050 is 50251446.

644152050 is a `hidden beast` number, since 644 + 15 + 2 + 0 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 551357361 + 92794689 = 23481^2 + 9633^2 .

It is not an unprimeable number, because it can be changed into a prime (644152051) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 715275 + ... + 716174.

Almost surely, 2^644152050 is an apocalyptic number.

644152050 is an abundant number, since it is smaller than the sum of its proper divisors (1086471000).

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

644152050 is a wasteful number, since it uses less digits than its factorization.

644152050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431467 (or 1431459 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 644152050 is about 25380.1507087724. The cubic root of 644152050 is about 863.6334688227.

The spelling of 644152050 in words is "six hundred forty-four million, one hundred fifty-two thousand, fifty".