663700620 has 96 divisors (see below), whose sum is σ = 2076834816. Its totient is φ = 156966400.

The previous prime is 663700601. The next prime is 663700637. The reversal of 663700620 is 26007366.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 14797 + ... + 39323.

It is an arithmetic number, because the mean of its divisors is an integer number (21633696).

Almost surely, 2^663700620 is an apocalyptic number.

663700620 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 663700620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038417408).

663700620 is an abundant number, since it is smaller than the sum of its proper divisors (1413134196).

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

663700620 is a wasteful number, since it uses less digits than its factorization.

663700620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24591 (or 24589 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 663700620 is about 25762.3876999008. The cubic root of 663700620 is about 872.2829984441.

Adding to 663700620 its reverse (26007366), we get a palindrome (689707986).

The spelling of 663700620 in words is "six hundred sixty-three million, seven hundred thousand, six hundred twenty".