663489792 has 270 divisors, whose sum is σ = 2304936018. Its totient is φ = 189278208.

The previous prime is 663489791. The next prime is 663489857. The reversal of 663489792 is 297984366.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 491774976 + 171714816 = 22176^2 + 13104^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663489791) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1015738 + ... + 1016390.

Almost surely, 2^663489792 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 663489792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1152468009).

663489792 is an abundant number, since it is smaller than the sum of its proper divisors (1641446226).

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

663489792 is an equidigital number, since it uses as much as digits as its factorization.

663489792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 665 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 663489792 is about 25758.2955957882. The cubic root of 663489792 is about 872.1906268987.

The spelling of 663489792 in words is "six hundred sixty-three million, four hundred eighty-nine thousand, seven hundred ninety-two".