1620400328 has 32 divisors (see below), whose sum is σ = 3075683520. Its totient is φ = 800280000.

The previous prime is 1620400321. The next prime is 1620400337. The reversal of 1620400328 is 8230040261.

It is a junction number, because it is equal to n+sod(n) for n = 1620400297 and 1620400306.

It is not an unprimeable number, because it can be changed into a prime (1620400321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214943 + ... + 222353.

It is an arithmetic number, because the mean of its divisors is an integer number (96115110).

Almost surely, 2^1620400328 is an apocalyptic number.

It is an amenable number.

1620400328 is a deficient number, since it is larger than the sum of its proper divisors (1455283192).

1620400328 is a wasteful number, since it uses less digits than its factorization.

1620400328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7749 (or 7745 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1620400328 is about 40254.1964023628. The cubic root of 1620400328 is about 1174.5570270454.

Adding to 1620400328 its reverse (8230040261), we get a palindrome (9850440589).

The spelling of 1620400328 in words is "one billion, six hundred twenty million, four hundred thousand, three hundred twenty-eight".