669650280 has 128 divisors (see below), whose sum is σ = 2175465600. Its totient is φ = 163924992.

The previous prime is 669650279. The next prime is 669650287. The reversal of 669650280 is 82056966.

669650280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (669650287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306231 + ... + 308409.

It is an arithmetic number, because the mean of its divisors is an integer number (16995825).

Almost surely, 2^669650280 is an apocalyptic number.

669650280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669650280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087732800).

669650280 is an abundant number, since it is smaller than the sum of its proper divisors (1505815320).

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

669650280 is a wasteful number, since it uses less digits than its factorization.

669650280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 669650280 is about 25877.6018981667. The cubic root of 669650280 is about 874.8817385748.

The spelling of 669650280 in words is "six hundred sixty-nine million, six hundred fifty thousand, two hundred eighty".