669399744 has 56 divisors (see below), whose sum is σ = 1907367280. Its totient is φ = 205968384.

The previous prime is 669399739. The next prime is 669399749. The reversal of 669399744 is 447993966.

669399744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (669399739) and next prime (669399749).

It is not an unprimeable number, because it can be changed into a prime (669399749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131599 + ... + 136590.

It is an arithmetic number, because the mean of its divisors is an integer number (34060130).

Almost surely, 2^669399744 is an apocalyptic number.

669399744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

669399744 is an abundant number, since it is smaller than the sum of its proper divisors (1237967536).

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

669399744 is a wasteful number, since it uses less digits than its factorization.

669399744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268217 (or 268207 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 57.

The square root of 669399744 is about 25872.7606567216. The cubic root of 669399744 is about 874.7726185766.

The spelling of 669399744 in words is "six hundred sixty-nine million, three hundred ninety-nine thousand, seven hundred forty-four".