669614420 has 24 divisors (see below), whose sum is σ = 1415153544. Its totient is φ = 266138496.

The previous prime is 669614417. The next prime is 669614431. The reversal of 669614420 is 24416966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 150544 + 669463876 = 388^2 + 25874^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103487 + ... + 109766.

It is an arithmetic number, because the mean of its divisors is an integer number (58964731).

Almost surely, 2^669614420 is an apocalyptic number.

It is an amenable number.

669614420 is an abundant number, since it is smaller than the sum of its proper divisors (745539124).

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

669614420 is a wasteful number, since it uses less digits than its factorization.

669614420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213419 (or 213417 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 669614420 is about 25876.9090117039. The cubic root of 669614420 is about 874.8661215579.

The spelling of 669614420 in words is "six hundred sixty-nine million, six hundred fourteen thousand, four hundred twenty".