643041402 has 16 divisors (see below), whose sum is σ = 1286512032. Its totient is φ = 214275600.

The previous prime is 643041397. The next prime is 643041433. The reversal of 643041402 is 204140346.

It is a super-2 number, since 2×643041402² = 827004489372251208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3573 + ... + 36039.

It is an arithmetic number, because the mean of its divisors is an integer number (80407002).

Almost surely, 2^643041402 is an apocalyptic number.

643041402 is an abundant number, since it is smaller than the sum of its proper divisors (643470630).

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

643041402 is a wasteful number, since it uses less digits than its factorization.

643041402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35773.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 643041402 is about 25358.2610208192. The cubic root of 643041402 is about 863.1368238695.

Adding to 643041402 its reverse (204140346), we get a palindrome (847181748).

The spelling of 643041402 in words is "six hundred forty-three million, forty-one thousand, four hundred two".