669575478 has 64 divisors (see below), whose sum is σ = 1583027712. Its totient is φ = 186132480.

The previous prime is 669575477. The next prime is 669575497. The reversal of 669575478 is 874575966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669575477) 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 31 ways as a sum of consecutive naturals, for example, 140950 + ... + 145622.

It is an arithmetic number, because the mean of its divisors is an integer number (24734808).

Almost surely, 2^669575478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669575478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791513856).

669575478 is an abundant number, since it is smaller than the sum of its proper divisors (913452234).

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

669575478 is a wasteful number, since it uses less digits than its factorization.

669575478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869.

The product of its digits is 12700800, while the sum is 57.

The square root of 669575478 is about 25876.1565538625. The cubic root of 669575478 is about 874.8491616997.

The spelling of 669575478 in words is "six hundred sixty-nine million, five hundred seventy-five thousand, four hundred seventy-eight".