643410652 has 6 divisors (see below), whose sum is σ = 1125968648. Its totient is φ = 321705324.

The previous prime is 643410643. The next prime is 643410653. The reversal of 643410652 is 256014346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643410653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80426328 + ... + 80426335.

Almost surely, 2^643410652 is an apocalyptic number.

It is an amenable number.

643410652 is a deficient number, since it is larger than the sum of its proper divisors (482557996).

643410652 is a wasteful number, since it uses less digits than its factorization.

643410652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160852667 (or 160852665 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 643410652 is about 25365.5406407985. The cubic root of 643410652 is about 863.3020036367.

Adding to 643410652 its reverse (256014346), we get a palindrome (899424998).

The spelling of 643410652 in words is "six hundred forty-three million, four hundred ten thousand, six hundred fifty-two".