643498352 has 20 divisors (see below), whose sum is σ = 1424889456. Its totient is φ = 275784960.

The previous prime is 643498337. The next prime is 643498357. The reversal of 643498352 is 253894346.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643498357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2872649 + ... + 2872872.

Almost surely, 2^643498352 is an apocalyptic number.

It is an amenable number.

643498352 is an abundant number, since it is smaller than the sum of its proper divisors (781391104).

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

643498352 is a wasteful number, since it uses less digits than its factorization.

643498352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5745536 (or 5745530 counting only the distinct ones).

The product of its digits is 622080, while the sum is 44.

The square root of 643498352 is about 25367.2693051499. The cubic root of 643498352 is about 863.3412259415.

The spelling of 643498352 in words is "six hundred forty-three million, four hundred ninety-eight thousand, three hundred fifty-two".