669356720 has 20 divisors (see below), whose sum is σ = 1556254560. Its totient is φ = 267742656.

The previous prime is 669356713. The next prime is 669356731. The reversal of 669356720 is 27653966.

669356720 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4183400 + ... + 4183559.

It is an arithmetic number, because the mean of its divisors is an integer number (77812728).

Almost surely, 2^669356720 is an apocalyptic number.

It is an amenable number.

669356720 is an abundant number, since it is smaller than the sum of its proper divisors (886897840).

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

669356720 is a wasteful number, since it uses less digits than its factorization.

669356720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8366972 (or 8366966 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 669356720 is about 25871.9291897609. The cubic root of 669356720 is about 874.7538768986.

It can be divided in two parts, 669356 and 720, that added together give a palindrome (670076).

The spelling of 669356720 in words is "six hundred sixty-nine million, three hundred fifty-six thousand, seven hundred twenty".