1620715636 has 12 divisors (see below), whose sum is σ = 2838448228. Its totient is φ = 809730432.

The previous prime is 1620715633. The next prime is 1620715667. The reversal of 1620715636 is 6365170261.

It can be written as a sum of positive squares in 2 ways, for example, as 1405800036 + 214915600 = 37494^2 + 14660^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1620715595 and 1620715604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620715633) 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, 151011 + ... + 161386.

Almost surely, 2^1620715636 is an apocalyptic number.

It is an amenable number.

1620715636 is a deficient number, since it is larger than the sum of its proper divisors (1217732592).

1620715636 is a wasteful number, since it uses less digits than its factorization.

1620715636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313698 (or 313696 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1620715636 is about 40258.1126730998. The cubic root of 1620715636 is about 1174.6332064112.

Adding to 1620715636 its reverse (6365170261), we get a palindrome (7985885897).

The spelling of 1620715636 in words is "one billion, six hundred twenty million, seven hundred fifteen thousand, six hundred thirty-six".