669307980 has 96 divisors (see below), whose sum is σ = 2110445568. Its totient is φ = 157017600.

The previous prime is 669307973. The next prime is 669308047. The reversal of 669307980 is 89703966.

It is a happy number.

669307980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4104 + ... + 36816.

It is an arithmetic number, because the mean of its divisors is an integer number (21983808).

Almost surely, 2^669307980 is an apocalyptic number.

669307980 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 669307980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055222784).

669307980 is an abundant number, since it is smaller than the sum of its proper divisors (1441137588).

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

669307980 is a wasteful number, since it uses less digits than its factorization.

669307980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32767 (or 32765 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 669307980 is about 25870.9872250751. The cubic root of 669307980 is about 874.7326443044.

The spelling of 669307980 in words is "six hundred sixty-nine million, three hundred seven thousand, nine hundred eighty".