669717420 has 48 divisors (see below), whose sum is σ = 1876331520. Its totient is φ = 178484416.

The previous prime is 669717409. The next prime is 669717421. The reversal of 669717420 is 24717966.

It is not an unprimeable number, because it can be changed into a prime (669717421) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 197701 + ... + 201059.

It is an arithmetic number, because the mean of its divisors is an integer number (39090240).

Almost surely, 2^669717420 is an apocalyptic number.

669717420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669717420 is an abundant number, since it is smaller than the sum of its proper divisors (1206614100).

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

669717420 is a wasteful number, since it uses less digits than its factorization.

669717420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694 (or 6692 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 669717420 is about 25878.8991265085. The cubic root of 669717420 is about 874.9109765212.

The spelling of 669717420 in words is "six hundred sixty-nine million, seven hundred seventeen thousand, four hundred twenty".