669560448 has 128 divisors (see below), whose sum is σ = 1832181120. Its totient is φ = 216559616.

The previous prime is 669560417. The next prime is 669560467. The reversal of 669560448 is 844065966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×669560448² = 896622387051921408, which contains 22 as substring.

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 = 669560397 and 669560406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3398686 + ... + 3398882.

It is an arithmetic number, because the mean of its divisors is an integer number (14313915).

Almost surely, 2^669560448 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 669560448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916090560).

669560448 is an abundant number, since it is smaller than the sum of its proper divisors (1162620672).

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

669560448 is a wasteful number, since it uses less digits than its factorization.

669560448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 422 counting only the distinct ones).

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

The square root of 669560448 is about 25875.8661304313. The cubic root of 669560448 is about 874.8426157206.

The spelling of 669560448 in words is "six hundred sixty-nine million, five hundred sixty thousand, four hundred forty-eight".