669788 has 24 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 271728.

The previous prime is 669787. The next prime is 669791. The reversal of 669788 is 887966.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669788.

It is not an unprimeable number, because it can be changed into a prime (669787) 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, 98 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2⁶⁶⁹⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

669788 is an abundant number, since it is smaller than the sum of its proper divisors (741412).

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

669788 is a wasteful number, since it uses less digits than its factorization.

669788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289 (or 1287 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 669788 is about 818.4057673306. The cubic root of 669788 is about 87.4941710403.

It can be divided in two parts, 66978 and 8, that multiplied together give a square (535824 = 732²).

The spelling of 669788 in words is "six hundred sixty-nine thousand, seven hundred eighty-eight".