643054040 has 16 divisors (see below), whose sum is σ = 1446871680. Its totient is φ = 257221600.

The previous prime is 643054021. The next prime is 643054081. The reversal of 643054040 is 40450346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8038136 + ... + 8038215.

It is an arithmetic number, because the mean of its divisors is an integer number (90429480).

Almost surely, 2^643054040 is an apocalyptic number.

It is an amenable number.

643054040 is an abundant number, since it is smaller than the sum of its proper divisors (803817640).

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

643054040 is a wasteful number, since it uses less digits than its factorization.

643054040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16076362 (or 16076358 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 643054040 is about 25358.5102086065. The cubic root of 643054040 is about 863.1424783793.

The spelling of 643054040 in words is "six hundred forty-three million, fifty-four thousand, forty".