669343920 has 320 divisors, whose sum is σ = 2485555200. Its totient is φ = 148872192.

The previous prime is 669343859. The next prime is 669343931. The reversal of 669343920 is 29343966.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3868954 + ... + 3869126.

It is an arithmetic number, because the mean of its divisors is an integer number (7767360).

Almost surely, 2^669343920 is an apocalyptic number.

669343920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669343920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242777600).

669343920 is an abundant number, since it is smaller than the sum of its proper divisors (1816211280).

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

669343920 is a wasteful number, since it uses less digits than its factorization.

669343920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 669343920 is about 25871.6818162252. The cubic root of 669343920 is about 874.7483009375.

The spelling of 669343920 in words is "six hundred sixty-nine million, three hundred forty-three thousand, nine hundred twenty".