1665893328 has 160 divisors (see below), whose sum is σ = 4854867840. Its totient is φ = 487802880.

The previous prime is 1665893323. The next prime is 1665893351. The reversal of 1665893328 is 8233985661.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665893321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5255026 + ... + 5255342.

It is an arithmetic number, because the mean of its divisors is an integer number (30342924).

Almost surely, 2^1665893328 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 1665893328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427433920).

1665893328 is an abundant number, since it is smaller than the sum of its proper divisors (3188974512).

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

1665893328 is a wasteful number, since it uses less digits than its factorization.

1665893328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 639 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The square root of 1665893328 is about 40815.3565217799. The cubic root of 1665893328 is about 1185.4476942515.

The spelling of 1665893328 in words is "one billion, six hundred sixty-five million, eight hundred ninety-three thousand, three hundred twenty-eight".