663187620 has 96 divisors (see below), whose sum is σ = 1893265920. Its totient is φ = 173422080.

The previous prime is 663187607. The next prime is 663187639. The reversal of 663187620 is 26781366.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 857554 + ... + 858326.

It is an arithmetic number, because the mean of its divisors is an integer number (19721520).

Almost surely, 2^663187620 is an apocalyptic number.

663187620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663187620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946632960).

663187620 is an abundant number, since it is smaller than the sum of its proper divisors (1230078300).

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

663187620 is a wasteful number, since it uses less digits than its factorization.

663187620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 663187620 is about 25752.4293999615. The cubic root of 663187620 is about 872.0582000405.

The spelling of 663187620 in words is "six hundred sixty-three million, one hundred eighty-seven thousand, six hundred twenty".