669026688 has 128 divisors (see below), whose sum is σ = 1953504000. Its totient is φ = 201185280.

The previous prime is 669026663. The next prime is 669026693. The reversal of 669026688 is 886620966.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 669026688.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 628845 + ... + 629907.

It is an arithmetic number, because the mean of its divisors is an integer number (15261750).

Almost surely, 2^669026688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669026688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976752000).

669026688 is an abundant number, since it is smaller than the sum of its proper divisors (1284477312).

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

669026688 is a wasteful number, since it uses less digits than its factorization.

669026688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 669026688 is about 25865.5502164559. The cubic root of 669026688 is about 874.6100849941.

The spelling of 669026688 in words is "six hundred sixty-nine million, twenty-six thousand, six hundred eighty-eight".