1620085505 has 8 divisors (see below), whose sum is σ = 1944340224. Its totient is φ = 1295910000.

The previous prime is 1620085487. The next prime is 1620085517. The reversal of 1620085505 is 5055800261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620085505 - 2¹² = 1620081409 is a prime.

It is a super-2 number, since 2×1620085505² = 5249354087022210050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43730 + ... + 71780.

It is an arithmetic number, because the mean of its divisors is an integer number (243042528).

Almost surely, 2^1620085505 is an apocalyptic number.

It is an amenable number.

1620085505 is a deficient number, since it is larger than the sum of its proper divisors (324254719).

1620085505 is a wasteful number, since it uses less digits than its factorization.

1620085505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39607.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 1620085505 is about 40250.2857753830. The cubic root of 1620085505 is about 1174.4809549969.

Adding to 1620085505 its reverse (5055800261), we get a palindrome (6675885766).

The spelling of 1620085505 in words is "one billion, six hundred twenty million, eighty-five thousand, five hundred five".