669289390 has 64 divisors (see below), whose sum is σ = 1505226240. Its totient is φ = 208160640.

The previous prime is 669289373. The next prime is 669289429. The reversal of 669289390 is 93982966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656301 + ... + 657319.

It is an arithmetic number, because the mean of its divisors is an integer number (23519160).

Almost surely, 2^669289390 is an apocalyptic number.

669289390 is an abundant number, since it is smaller than the sum of its proper divisors (835936850).

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

669289390 is a wasteful number, since it uses less digits than its factorization.

669289390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 669289390 is about 25870.6279398085. The cubic root of 669289390 is about 874.7245456757.

The spelling of 669289390 in words is "six hundred sixty-nine million, two hundred eighty-nine thousand, three hundred ninety".