663617620 has 96 divisors (see below), whose sum is σ = 1515386880. Its totient is φ = 243386880.

The previous prime is 663617599. The next prime is 663617623. The reversal of 663617620 is 26716366.

It is a self number, because there is not a number n which added to its sum of digits gives 663617620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663617623) 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, 2466846 + ... + 2467114.

It is an arithmetic number, because the mean of its divisors is an integer number (15785280).

Almost surely, 2^663617620 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 663617620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757693440).

663617620 is an abundant number, since it is smaller than the sum of its proper divisors (851769260).

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

663617620 is a wasteful number, since it uses less digits than its factorization.

663617620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 663617620 is about 25760.7767740028. The cubic root of 663617620 is about 872.2466354089.

The spelling of 663617620 in words is "six hundred sixty-three million, six hundred seventeen thousand, six hundred twenty".