1620273233 has 4 divisors (see below), whose sum is σ = 1631147700. Its totient is φ = 1609398768.

The previous prime is 1620273223. The next prime is 1620273251. The reversal of 1620273233 is 3323720261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 184090624 + 1436182609 = 13568^2 + 37897^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620273233 - 2⁴ = 1620273217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620273196 and 1620273205.

It is not an unprimeable number, because it can be changed into a prime (1620273223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5437010 + ... + 5437307.

It is an arithmetic number, because the mean of its divisors is an integer number (407786925).

Almost surely, 2^1620273233 is an apocalyptic number.

It is an amenable number.

1620273233 is a deficient number, since it is larger than the sum of its proper divisors (10874467).

1620273233 is a wasteful number, since it uses less digits than its factorization.

1620273233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10874466.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 1620273233 is about 40252.6177161188. The cubic root of 1620273233 is about 1174.5263177147.

Adding to 1620273233 its reverse (3323720261), we get a palindrome (4943993494).

The spelling of 1620273233 in words is "one billion, six hundred twenty million, two hundred seventy-three thousand, two hundred thirty-three".