646144342 has 8 divisors (see below), whose sum is σ = 969520032. Its totient is φ = 322971000.

The previous prime is 646144337. The next prime is 646144351. The reversal of 646144342 is 243441646.

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

It is a super-2 number, since 2×646144342² = 835005021397225928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646144298 and 646144307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42334 + ... + 55537.

It is an arithmetic number, because the mean of its divisors is an integer number (121190004).

Almost surely, 2^646144342 is an apocalyptic number.

646144342 is a deficient number, since it is larger than the sum of its proper divisors (323375690).

646144342 is a wasteful number, since it uses less digits than its factorization.

646144342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101174.

The product of its digits is 55296, while the sum is 34.

The square root of 646144342 is about 25419.3694256958. The cubic root of 646144342 is about 864.5229271456.

Adding to 646144342 its reverse (243441646), we get a palindrome (889585988).

The spelling of 646144342 in words is "six hundred forty-six million, one hundred forty-four thousand, three hundred forty-two".