669904560 has 160 divisors (see below), whose sum is σ = 2485049280. Its totient is φ = 164892672.

The previous prime is 669904541. The next prime is 669904561. The reversal of 669904560 is 65409966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (669904561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16152 + ... + 40008.

It is an arithmetic number, because the mean of its divisors is an integer number (15531558).

Almost surely, 2^669904560 is an apocalyptic number.

669904560 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 669904560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242524640).

669904560 is an abundant number, since it is smaller than the sum of its proper divisors (1815144720).

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

669904560 is a wasteful number, since it uses less digits than its factorization.

669904560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23892 (or 23880 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 669904560 is about 25882.5145609927. The cubic root of 669904560 is about 874.9924614317.

The spelling of 669904560 in words is "six hundred sixty-nine million, nine hundred four thousand, five hundred sixty".