643346144 has 24 divisors (see below), whose sum is σ = 1447529328. Its totient is φ = 275719680.

The previous prime is 643346083. The next prime is 643346173. The reversal of 643346144 is 441643346.

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, 1435817 + ... + 1436264.

It is an arithmetic number, because the mean of its divisors is an integer number (60313722).

Almost surely, 2^643346144 is an apocalyptic number.

It is an amenable number.

643346144 is an abundant number, since it is smaller than the sum of its proper divisors (804183184).

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

643346144 is a wasteful number, since it uses less digits than its factorization.

643346144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872098 (or 2872090 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

The square root of 643346144 is about 25364.2690413108. The cubic root of 643346144 is about 863.2731512769.

The spelling of 643346144 in words is "six hundred forty-three million, three hundred forty-six thousand, one hundred forty-four".