669968280 has 128 divisors (see below), whose sum is σ = 2305382400. Its totient is φ = 172886400.

The previous prime is 669968279. The next prime is 669968333. The reversal of 669968280 is 82869966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23475 + ... + 43485.

It is an arithmetic number, because the mean of its divisors is an integer number (18010800).

Almost surely, 2^669968280 is an apocalyptic number.

669968280 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 669968280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1152691200).

669968280 is an abundant number, since it is smaller than the sum of its proper divisors (1635414120).

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

669968280 is a wasteful number, since it uses less digits than its factorization.

669968280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20062 (or 20052 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 669968280 is about 25883.7454785817. The cubic root of 669968280 is about 875.0202030709.

The spelling of 669968280 in words is "six hundred sixty-nine million, nine hundred sixty-eight thousand, two hundred eighty".