643465134 has 120 divisors (see below), whose sum is σ = 1644782040. Its totient is φ = 187417152.

The previous prime is 643465127. The next prime is 643465139. The reversal of 643465134 is 431564346.

643465134 is a `hidden beast` number, since 64 + 3 + 465 + 134 = 666.

Its product of digits (103680) is a multiple of the sum of its prime factors (1296).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643465139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 519564 + ... + 520800.

It is an arithmetic number, because the mean of its divisors is an integer number (13706517).

Almost surely, 2^643465134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643465134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822391020).

643465134 is an abundant number, since it is smaller than the sum of its proper divisors (1001316906).

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

643465134 is a wasteful number, since it uses less digits than its factorization.

643465134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1274 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 643465134 is about 25366.6145553560. The cubic root of 643465134 is about 863.3263701861.

The spelling of 643465134 in words is "six hundred forty-three million, four hundred sixty-five thousand, one hundred thirty-four".