643061215 has 8 divisors (see below), whose sum is σ = 772048368. Its totient is φ = 514199040.

The previous prime is 643061197. The next prime is 643061219. The reversal of 643061215 is 512160346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643061215 - 2¹¹ = 643059167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643061219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19522 + ... + 40831.

It is an arithmetic number, because the mean of its divisors is an integer number (96506046).

Almost surely, 2^643061215 is an apocalyptic number.

643061215 is a deficient number, since it is larger than the sum of its proper divisors (128987153).

643061215 is a wasteful number, since it uses less digits than its factorization.

643061215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62489.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 643061215 is about 25358.6516794565. The cubic root of 643061215 is about 863.1456885938.

The spelling of 643061215 in words is "six hundred forty-three million, sixty-one thousand, two hundred fifteen".