669361280 has 64 divisors (see below), whose sum is σ = 1828802880. Its totient is φ = 229493760.

The previous prime is 669361243. The next prime is 669361321. The reversal of 669361280 is 82163966.

It is a tau number, because it is divible by the number of its divisors (64).

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 7 ways as a sum of consecutive naturals, for example, 70226 + ... + 79185.

It is an arithmetic number, because the mean of its divisors is an integer number (28575045).

Almost surely, 2^669361280 is an apocalyptic number.

It is an amenable number.

669361280 is an abundant number, since it is smaller than the sum of its proper divisors (1159441600).

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

669361280 is a wasteful number, since it uses less digits than its factorization.

669361280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149437 (or 149425 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 669361280 is about 25872.0173160115. The cubic root of 669361280 is about 874.7558633175.

The spelling of 669361280 in words is "six hundred sixty-nine million, three hundred sixty-one thousand, two hundred eighty".