1620001730 has 8 divisors (see below), whose sum is σ = 2916003132. Its totient is φ = 648000688.

The previous prime is 1620001681. The next prime is 1620001783. The reversal of 1620001730 is 371000261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1619499049 + 502681 = 40243^2 + 709^2 .

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

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, 81000077 + ... + 81000096.

Almost surely, 2^1620001730 is an apocalyptic number.

1620001730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620001730 is a deficient number, since it is larger than the sum of its proper divisors (1296001402).

1620001730 is a wasteful number, since it uses less digits than its factorization.

1620001730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162000180.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1620001730 is about 40249.2450860883. The cubic root of 1620001730 is about 1174.4607104197.

Adding to 1620001730 its reverse (371000261), we get a palindrome (1991001991).

The spelling of 1620001730 in words is "one billion, six hundred twenty million, one thousand, seven hundred thirty".