642994446 has 8 divisors (see below), whose sum is σ = 1285988904. Its totient is φ = 214331480.

The previous prime is 642994441. The next prime is 642994487. The reversal of 642994446 is 644499246.

It is a happy number.

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

642994446 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 642994395 and 642994404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642994441) by changing a digit.

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, 53582865 + ... + 53582876.

It is an arithmetic number, because the mean of its divisors is an integer number (160748613).

Almost surely, 2^642994446 is an apocalyptic number.

642994446 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642994446 is a wasteful number, since it uses less digits than its factorization.

642994446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107165746.

The product of its digits is 1492992, while the sum is 48.

The square root of 642994446 is about 25357.3351517860. The cubic root of 642994446 is about 863.1158141081.

The spelling of 642994446 in words is "six hundred forty-two million, nine hundred ninety-four thousand, four hundred forty-six".