669280 has 48 divisors (see below), whose sum is σ = 1632960. Its totient is φ = 259072.

The previous prime is 669271. The next prime is 669283. The reversal of 669280 is 82966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7476 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2⁶⁶⁹²⁸⁰ 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 669280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816480).

669280 is an abundant number, since it is smaller than the sum of its proper divisors (963680).

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

669280 is a wasteful number, since it uses less digits than its factorization.

669280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 669280 is about 818.0953489661. The cubic root of 669280 is about 87.4720454918.

It can be divided in two parts, 669 and 280, that added together give a palindrome (949).

The spelling of 669280 in words is "six hundred sixty-nine thousand, two hundred eighty".