669765 has 8 divisors (see below), whose sum is σ = 1071648. Its totient is φ = 357200.

The previous prime is 669763. The next prime is 669787. The reversal of 669765 is 567966.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 669765 - 2¹ = 669763 is a prime.

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 669765.

It is not an unprimeable number, because it can be changed into a prime (669763) 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, 22311 + ... + 22340.

It is an arithmetic number, because the mean of its divisors is an integer number (133956).

2⁶⁶⁹⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

669765 is a deficient number, since it is larger than the sum of its proper divisors (401883).

669765 is a wasteful number, since it uses less digits than its factorization.

669765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44659.

The product of its digits is 68040, while the sum is 39.

The square root of 669765 is about 818.3917155006. The cubic root of 669765 is about 87.4931695348.

The spelling of 669765 in words is "six hundred sixty-nine thousand, seven hundred sixty-five".