669589742 has 8 divisors (see below), whose sum is σ = 1004503896. Its totient is φ = 334755112.

The previous prime is 669589717. The next prime is 669589747. The reversal of 669589742 is 247985966.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669589747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10388 + ... + 38040.

It is an arithmetic number, because the mean of its divisors is an integer number (125562987).

Almost surely, 2^669589742 is an apocalyptic number.

669589742 is a deficient number, since it is larger than the sum of its proper divisors (334914154).

669589742 is a wasteful number, since it uses less digits than its factorization.

669589742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39762.

The product of its digits is 6531840, while the sum is 56.

The square root of 669589742 is about 25876.4321729252. The cubic root of 669589742 is about 874.8553739741.

The spelling of 669589742 in words is "six hundred sixty-nine million, five hundred eighty-nine thousand, seven hundred forty-two".