663746080 has 24 divisors (see below), whose sum is σ = 1568100492. Its totient is φ = 265498368.

The previous prime is 663746077. The next prime is 663746081. The reversal of 663746080 is 80647366.

It can be written as a sum of positive squares in 2 ways, for example, as 663371536 + 374544 = 25756^2 + 612^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (663746081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074047 + ... + 2074366.

Almost surely, 2^663746080 is an apocalyptic number.

It is an amenable number.

663746080 is an abundant number, since it is smaller than the sum of its proper divisors (904354412).

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

663746080 is a wasteful number, since it uses less digits than its factorization.

663746080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148428 (or 4148420 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 663746080 is about 25763.2699787896. The cubic root of 663746080 is about 872.3029135879.

The spelling of 663746080 in words is "six hundred sixty-three million, seven hundred forty-six thousand, eighty".