643741410 has 128 divisors (see below), whose sum is σ = 1723244544. Its totient is φ = 152893440.

The previous prime is 643741393. The next prime is 643741453. The reversal of 643741410 is 14147346.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 63 ways as a sum of consecutive naturals, for example, 2030572 + ... + 2030888.

It is an arithmetic number, because the mean of its divisors is an integer number (13462848).

Almost surely, 2^643741410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643741410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861622272).

643741410 is an abundant number, since it is smaller than the sum of its proper divisors (1079503134).

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

643741410 is a wasteful number, since it uses less digits than its factorization.

643741410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 643741410 is about 25372.0596325959. The cubic root of 643741410 is about 863.4499107975.

Adding to 643741410 its reverse (14147346), we get a palindrome (657888756).

The spelling of 643741410 in words is "six hundred forty-three million, seven hundred forty-one thousand, four hundred ten".