1605000028 has 6 divisors (see below), whose sum is σ = 2808750056. Its totient is φ = 802500012.

The previous prime is 1605000017. The next prime is 1605000049. The reversal of 1605000028 is 8200005061.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1604999972 and 1605000008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200625000 + ... + 200625007.

Almost surely, 2^1605000028 is an apocalyptic number.

It is an amenable number.

1605000028 is a deficient number, since it is larger than the sum of its proper divisors (1203750028).

1605000028 is a wasteful number, since it uses less digits than its factorization.

1605000028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401250011 (or 401250009 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1605000028 is about 40062.4515974747. The cubic root of 1605000028 is about 1170.8241759117.

Adding to 1605000028 its reverse (8200005061), we get a palindrome (9805005089).

The spelling of 1605000028 in words is "one billion, six hundred five million, twenty-eight", and thus it is an aban number.