664642446 has 32 divisors (see below), whose sum is σ = 1435378560. Its totient is φ = 203956704.

The previous prime is 664642427. The next prime is 664642457. The reversal of 664642446 is 644246466.

It is a junction number, because it is equal to n+sod(n) for n = 664642398 and 664642407.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18321 + ... + 40803.

It is an arithmetic number, because the mean of its divisors is an integer number (44855580).

Almost surely, 2^664642446 is an apocalyptic number.

664642446 is an abundant number, since it is smaller than the sum of its proper divisors (770736114).

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

664642446 is a wasteful number, since it uses less digits than its factorization.

664642446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880.

The product of its digits is 663552, while the sum is 42.

The square root of 664642446 is about 25780.6603096197. The cubic root of 664642446 is about 872.6954085411.

The spelling of 664642446 in words is "six hundred sixty-four million, six hundred forty-two thousand, four hundred forty-six".