626666404 has 48 divisors (see below), whose sum is σ = 1352268288. Its totient is φ = 247448448.

The previous prime is 626666399. The next prime is 626666407. The reversal of 626666404 is 404666626.

It is not an unprimeable number, because it can be changed into a prime (626666407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245157 + ... + 247699.

It is an arithmetic number, because the mean of its divisors is an integer number (28172256).

Almost surely, 2^626666404 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 626666404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (676134144).

626666404 is an abundant number, since it is smaller than the sum of its proper divisors (725601884).

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

626666404 is a wasteful number, since it uses less digits than its factorization.

626666404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244 (or 3242 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 626666404 is about 25033.3058943480. The cubic root of 626666404 is about 855.7471685391.

The spelling of 626666404 in words is "six hundred twenty-six million, six hundred sixty-six thousand, four hundred four".