1669451904 has 128 divisors (see below), whose sum is σ = 5008608000. Its totient is φ = 547292160.

The previous prime is 1669451887. The next prime is 1669451911. The reversal of 1669451904 is 4091549661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 1669451904.

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, 206857 + ... + 214775.

It is an arithmetic number, because the mean of its divisors is an integer number (39129750).

Almost surely, 2^1669451904 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 1669451904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2504304000).

1669451904 is an abundant number, since it is smaller than the sum of its proper divisors (3339156096).

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

1669451904 is an equidigital number, since it uses as much as digits as its factorization.

1669451904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8003 (or 7985 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1669451904 is about 40858.9268581543. The cubic root of 1669451904 is about 1186.2911867358.

The spelling of 1669451904 in words is "one billion, six hundred sixty-nine million, four hundred fifty-one thousand, nine hundred four".