1665281228 has 12 divisors (see below), whose sum is σ = 3138414720. Its totient is φ = 768591312.

The previous prime is 1665281203. The next prime is 1665281231. The reversal of 1665281228 is 8221825661.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 16012268 + ... + 16012371.

It is an arithmetic number, because the mean of its divisors is an integer number (261534560).

Almost surely, 2^1665281228 is an apocalyptic number.

It is an amenable number.

1665281228 is a deficient number, since it is larger than the sum of its proper divisors (1473133492).

1665281228 is a wasteful number, since it uses less digits than its factorization.

1665281228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32024656 (or 32024654 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 1665281228 is about 40807.8574296667. The cubic root of 1665281228 is about 1185.3024865902.

The spelling of 1665281228 in words is "one billion, six hundred sixty-five million, two hundred eighty-one thousand, two hundred twenty-eight".