1628161605 has 48 divisors (see below), whose sum is σ = 3365556480. Its totient is φ = 711938304.

The previous prime is 1628161603. The next prime is 1628161609. The reversal of 1628161605 is 5061618261.

1628161605 is a `hidden beast` number, since 1 + 628 + 16 + 16 + 0 + 5 = 666.

It is not a de Polignac number, because 1628161605 - 2¹ = 1628161603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1628161605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628161603) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 105120 + ... + 119609.

It is an arithmetic number, because the mean of its divisors is an integer number (70115760).

Almost surely, 2^1628161605 is an apocalyptic number.

1628161605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1628161605 is an abundant number, since it is smaller than the sum of its proper divisors (1737394875).

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

1628161605 is a wasteful number, since it uses less digits than its factorization.

1628161605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224770 (or 224767 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1628161605 is about 40350.4845695811. The cubic root of 1628161605 is about 1176.4293105794.

Adding to 1628161605 its reverse (5061618261), we get a palindrome (6689779866).

The spelling of 1628161605 in words is "one billion, six hundred twenty-eight million, one hundred sixty-one thousand, six hundred five".