669783 has 16 divisors (see below), whose sum is σ = 988416. Its totient is φ = 401280.

The previous prime is 669763. The next prime is 669787. The reversal of 669783 is 387966.

669783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669783 - 2⁸ = 669527 is a prime.

It is an Ulam number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 888 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (61776).

2⁶⁶⁹⁷⁸³ is an apocalyptic number.

669783 is a deficient number, since it is larger than the sum of its proper divisors (318633).

669783 is a wasteful number, since it uses less digits than its factorization.

669783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its digits is 54432, while the sum is 39.

The square root of 669783 is about 818.4027126055. The cubic root of 669783 is about 87.4939533237.

The spelling of 669783 in words is "six hundred sixty-nine thousand, seven hundred eighty-three".