1669842720 has 288 divisors, whose sum is σ = 7013889792. Its totient is φ = 352290816.

The previous prime is 1669842709. The next prime is 1669842739. The reversal of 1669842720 is 272489661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124669 + ... + 137411.

It is an arithmetic number, because the mean of its divisors is an integer number (24353784).

Almost surely, 2^1669842720 is an apocalyptic number.

1669842720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669842720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3506944896).

1669842720 is an abundant number, since it is smaller than the sum of its proper divisors (5344047072).

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

1669842720 is a wasteful number, since it uses less digits than its factorization.

1669842720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12784 (or 12773 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1669842720 is about 40863.7090827546. The cubic root of 1669842720 is about 1186.3837491315.

The spelling of 1669842720 in words is "one billion, six hundred sixty-nine million, eight hundred forty-two thousand, seven hundred twenty".