645440342 has 8 divisors (see below), whose sum is σ = 968532600. Its totient is φ = 322596144.

The previous prime is 645440311. The next prime is 645440347. The reversal of 645440342 is 243044546.

645440342 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 645440299 and 645440308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645440347) 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, 55367 + ... + 66002.

It is an arithmetic number, because the mean of its divisors is an integer number (121066575).

Almost surely, 2^645440342 is an apocalyptic number.

645440342 is a deficient number, since it is larger than the sum of its proper divisors (323092258).

645440342 is a wasteful number, since it uses less digits than its factorization.

645440342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124030.

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 645440342 is about 25405.5179439428. The cubic root of 645440342 is about 864.2088356570.

Adding to 645440342 its reverse (243044546), we get a palindrome (888484888).

The spelling of 645440342 in words is "six hundred forty-five million, four hundred forty thousand, three hundred forty-two".