1620539328 has 84 divisors (see below), whose sum is σ = 4332501368. Its totient is φ = 534589440.

The previous prime is 1620539281. The next prime is 1620539329. The reversal of 1620539328 is 8239350261.

It is a super-2 number, since 2×1620539328² = 5252295427189383168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620539329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2451318 + ... + 2451978.

Almost surely, 2^1620539328 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 1620539328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2166250684).

1620539328 is an abundant number, since it is smaller than the sum of its proper divisors (2711962040).

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

1620539328 is an equidigital number, since it uses as much as digits as its factorization.

1620539328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1620539328 is about 40255.9228934079. The cubic root of 1620539328 is about 1174.5906110834.

Adding to 1620539328 its reverse (8239350261), we get a palindrome (9859889589).

The spelling of 1620539328 in words is "one billion, six hundred twenty million, five hundred thirty-nine thousand, three hundred twenty-eight".