669425792 has 64 divisors (see below), whose sum is σ = 1576756800. Its totient is φ = 276993024.

The previous prime is 669425761. The next prime is 669425891. The reversal of 669425792 is 297524966.

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

It is a self number, because there is not a number n which added to its sum of digits gives 669425792.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13103 + ... + 38865.

It is an arithmetic number, because the mean of its divisors is an integer number (24636825).

Almost surely, 2^669425792 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 669425792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788378400).

669425792 is an abundant number, since it is smaller than the sum of its proper divisors (907331008).

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

669425792 is a wasteful number, since it uses less digits than its factorization.

669425792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25813 (or 25801 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The square root of 669425792 is about 25873.2640383853. The cubic root of 669425792 is about 874.7839649517.

The spelling of 669425792 in words is "six hundred sixty-nine million, four hundred twenty-five thousand, seven hundred ninety-two".