669287840 has 96 divisors (see below), whose sum is σ = 1711369296. Its totient is φ = 245882880.

The previous prime is 669287821. The next prime is 669287851. The reversal of 669287840 is 48782966.

It can be written as a sum of positive squares in 8 ways, for example, as 73342096 + 595945744 = 8564^2 + 24412^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483950 + ... + 485330.

Almost surely, 2^669287840 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 669287840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855684648).

669287840 is an abundant number, since it is smaller than the sum of its proper divisors (1042081456).

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

669287840 is a wasteful number, since it uses less digits than its factorization.

669287840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642 (or 1634 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 669287840 is about 25870.5979830386. The cubic root of 669287840 is about 874.7238704201.

The spelling of 669287840 in words is "six hundred sixty-nine million, two hundred eighty-seven thousand, eight hundred forty".