666629424 has 120 divisors (see below), whose sum is σ = 1955446272. Its totient is φ = 211601280.

The previous prime is 666629417. The next prime is 666629441. The reversal of 666629424 is 424926666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 666629424.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1427239 + ... + 1427705.

Almost surely, 2^666629424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666629424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977723136).

666629424 is an abundant number, since it is smaller than the sum of its proper divisors (1288816848).

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

666629424 is a wasteful number, since it uses less digits than its factorization.

666629424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 926 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 666629424 is about 25819.1677635047. The cubic root of 666629424 is about 873.5641972003.

The spelling of 666629424 in words is "six hundred sixty-six million, six hundred twenty-nine thousand, four hundred twenty-four".