1620245328 has 80 divisors (see below), whose sum is σ = 4522377216. Its totient is φ = 496903680.

The previous prime is 1620245323. The next prime is 1620245329. The reversal of 1620245328 is 8235420261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620245323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193713 + ... + 201903.

Almost surely, 2^1620245328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620245328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2261188608).

1620245328 is an abundant number, since it is smaller than the sum of its proper divisors (2902131888).

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

1620245328 is a wasteful number, since it uses less digits than its factorization.

1620245328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8532 (or 8526 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 1620245328 is about 40252.2710912068. The cubic root of 1620245328 is about 1174.5195749538.

Adding to 1620245328 its reverse (8235420261), we get a palindrome (9855665589).

The spelling of 1620245328 in words is "one billion, six hundred twenty million, two hundred forty-five thousand, three hundred twenty-eight".