665303424 has 128 divisors (see below), whose sum is σ = 1823662080. Its totient is φ = 214794240.

The previous prime is 665303417. The next prime is 665303459. The reversal of 665303424 is 424303566.

665303424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×665303424² = 885257291972247552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3447072 + ... + 3447264.

It is an arithmetic number, because the mean of its divisors is an integer number (14247360).

Almost surely, 2^665303424 is an apocalyptic number.

665303424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665303424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911831040).

665303424 is an abundant number, since it is smaller than the sum of its proper divisors (1158358656).

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

665303424 is a wasteful number, since it uses less digits than its factorization.

665303424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 665303424 is about 25793.4763845434. The cubic root of 665303424 is about 872.9846073213.

The spelling of 665303424 in words is "six hundred sixty-five million, three hundred three thousand, four hundred twenty-four".