669335280 has 80 divisors (see below), whose sum is σ = 2077441440. Its totient is φ = 178274304.

The previous prime is 669335239. The next prime is 669335299. The reversal of 669335280 is 82533966.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356424 + ... + 358296.

It is an arithmetic number, because the mean of its divisors is an integer number (25968018).

Almost surely, 2^669335280 is an apocalyptic number.

669335280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669335280 is an abundant number, since it is smaller than the sum of its proper divisors (1408106160).

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

669335280 is a wasteful number, since it uses less digits than its factorization.

669335280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378 (or 3372 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 669335280 is about 25871.5148377516. The cubic root of 669335280 is about 874.7445371236.

The spelling of 669335280 in words is "six hundred sixty-nine million, three hundred thirty-five thousand, two hundred eighty".