669993440 has 24 divisors (see below), whose sum is σ = 1582859880. Its totient is φ = 267997312.

The previous prime is 669993437. The next prime is 669993503. The reversal of 669993440 is 44399966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2093570 + ... + 2093889.

It is an arithmetic number, because the mean of its divisors is an integer number (65952495).

Almost surely, 2^669993440 is an apocalyptic number.

It is an amenable number.

669993440 is an abundant number, since it is smaller than the sum of its proper divisors (912866440).

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

669993440 is a wasteful number, since it uses less digits than its factorization.

669993440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187474 (or 4187466 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 50.

The square root of 669993440 is about 25884.2314933243. The cubic root of 669993440 is about 875.0311564416.

The spelling of 669993440 in words is "six hundred sixty-nine million, nine hundred ninety-three thousand, four hundred forty".