1665477828 has 96 divisors (see below), whose sum is σ = 5225068800. Its totient is φ = 447856128.

The previous prime is 1665477809. The next prime is 1665477871. The reversal of 1665477828 is 8287745661.

1665477828 is a `hidden beast` number, since 1 + 6 + 6 + 547 + 78 + 28 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 31 ways as a sum of consecutive naturals, for example, 51943 + ... + 77646.

It is an arithmetic number, because the mean of its divisors is an integer number (54427800).

Almost surely, 2^1665477828 is an apocalyptic number.

1665477828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1665477828 is an abundant number, since it is smaller than the sum of its proper divisors (3559590972).

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

1665477828 is a wasteful number, since it uses less digits than its factorization.

1665477828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129626 (or 129618 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 1665477828 is about 40810.2662083942. The cubic root of 1665477828 is about 1185.3491296227.

The spelling of 1665477828 in words is "one billion, six hundred sixty-five million, four hundred seventy-seven thousand, eight hundred twenty-eight".