669225648 has 160 divisors (see below), whose sum is σ = 2138752000. Its totient is φ = 175592448.

The previous prime is 669225637. The next prime is 669225653. The reversal of 669225648 is 846522966.

It is a happy number.

669225648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 669225597 and 669225606.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1524213 + ... + 1524651.

It is an arithmetic number, because the mean of its divisors is an integer number (13367200).

Almost surely, 2^669225648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669225648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1069376000).

669225648 is an abundant number, since it is smaller than the sum of its proper divisors (1469526352).

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

669225648 is a wasteful number, since it uses less digits than its factorization.

669225648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 813 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 48.

The square root of 669225648 is about 25869.3959728479. The cubic root of 669225648 is about 874.6967756941.

The spelling of 669225648 in words is "six hundred sixty-nine million, two hundred twenty-five thousand, six hundred forty-eight".