669380 has 12 divisors (see below), whose sum is σ = 1405740. Its totient is φ = 267744.

The previous prime is 669379. The next prime is 669391. The reversal of 669380 is 83966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 228484 + 440896 = 478^2 + 664^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16715 + ... + 16754.

It is an arithmetic number, because the mean of its divisors is an integer number (117145).

2⁶⁶⁹³⁸⁰ is an apocalyptic number.

It is an amenable number.

669380 is an abundant number, since it is smaller than the sum of its proper divisors (736360).

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

669380 is a wasteful number, since it uses less digits than its factorization.

669380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33478 (or 33476 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 669380 is about 818.1564642536. The cubic root of 669380 is about 87.4764017996.

The spelling of 669380 in words is "six hundred sixty-nine thousand, three hundred eighty".