643275742 has 8 divisors (see below), whose sum is σ = 1015698600. Its totient is φ = 304709544.

The previous prime is 643275739. The next prime is 643275769. The reversal of 643275742 is 247572346.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 643275695 and 643275704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8464117 + ... + 8464192.

It is an arithmetic number, because the mean of its divisors is an integer number (126962325).

Almost surely, 2^643275742 is an apocalyptic number.

643275742 is a deficient number, since it is larger than the sum of its proper divisors (372422858).

643275742 is a wasteful number, since it uses less digits than its factorization.

643275742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16928330.

The product of its digits is 282240, while the sum is 40.

The square root of 643275742 is about 25362.8811849127. The cubic root of 643275742 is about 863.2416605188.

The spelling of 643275742 in words is "six hundred forty-three million, two hundred seventy-five thousand, seven hundred forty-two".