663747940 has 24 divisors (see below), whose sum is σ = 1441936440. Its totient is φ = 256343808.

The previous prime is 663747923. The next prime is 663747941. The reversal of 663747940 is 49747366.

It can be written as a sum of positive squares in 4 ways, for example, as 87459904 + 576288036 = 9352^2 + 24006^2 .

It is a super-2 number, since 2×663747940² = 881122655708487200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663747941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571617 + ... + 572776.

It is an arithmetic number, because the mean of its divisors is an integer number (60080685).

Almost surely, 2^663747940 is an apocalyptic number.

It is an amenable number.

663747940 is an abundant number, since it is smaller than the sum of its proper divisors (778188500).

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

663747940 is a wasteful number, since it uses less digits than its factorization.

663747940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144431 (or 1144429 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 46.

The square root of 663747940 is about 25763.3060766665. The cubic root of 663747940 is about 872.3037283984.

The spelling of 663747940 in words is "six hundred sixty-three million, seven hundred forty-seven thousand, nine hundred forty".