669519072 has 72 divisors (see below), whose sum is σ = 1907614800. Its totient is φ = 222743040.

The previous prime is 669519061. The next prime is 669519091. The reversal of 669519072 is 270915966.

It is a happy number.

669519072 is a `hidden beast` number, since 6 + 69 + 519 + 0 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 170572 + ... + 174452.

It is an arithmetic number, because the mean of its divisors is an integer number (26494650).

Almost surely, 2^669519072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669519072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953807400).

669519072 is an abundant number, since it is smaller than the sum of its proper divisors (1238095728).

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

669519072 is a wasteful number, since it uses less digits than its factorization.

669519072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496 (or 4485 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 669519072 is about 25875.0666086099. The cubic root of 669519072 is about 874.8245948265.

The spelling of 669519072 in words is "six hundred sixty-nine million, five hundred nineteen thousand, seventy-two".