1668628424 has 8 divisors (see below), whose sum is σ = 3128678310. Its totient is φ = 834314208.

The previous prime is 1668628417. The next prime is 1668628433. The reversal of 1668628424 is 4248268661.

It can be written as a sum of positive squares in only one way, i.e., 1042127524 + 626500900 = 32282^2 + 25030^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104289269 + ... + 104289284.

Almost surely, 2^1668628424 is an apocalyptic number.

It is an amenable number.

1668628424 is a deficient number, since it is larger than the sum of its proper divisors (1460049886).

1668628424 is a wasteful number, since it uses less digits than its factorization.

1668628424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208578559 (or 208578555 counting only the distinct ones).

The product of its digits is 884736, while the sum is 47.

The square root of 1668628424 is about 40848.8485027424. The cubic root of 1668628424 is about 1186.0961032019.

The spelling of 1668628424 in words is "one billion, six hundred sixty-eight million, six hundred twenty-eight thousand, four hundred twenty-four".