1620974208 has 256 divisors, whose sum is σ = 5487436800. Its totient is φ = 412729344.

The previous prime is 1620974183. The next prime is 1620974209. The reversal of 1620974208 is 8024790261.

It is not an unprimeable number, because it can be changed into a prime (1620974209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 867291 + ... + 869157.

It is an arithmetic number, because the mean of its divisors is an integer number (21435300).

Almost surely, 2^1620974208 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 1620974208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2743718400).

1620974208 is an abundant number, since it is smaller than the sum of its proper divisors (3866462592).

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

1620974208 is a wasteful number, since it uses less digits than its factorization.

1620974208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1915 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1620974208 is about 40261.3239722690. The cubic root of 1620974208 is about 1174.6956708148.

The spelling of 1620974208 in words is "one billion, six hundred twenty million, nine hundred seventy-four thousand, two hundred eight".