663240 has 32 divisors (see below), whose sum is σ = 1990080. Its totient is φ = 176832.

The previous prime is 663239. The next prime is 663241. The reversal of 663240 is 42366.

It is an interprime number because it is at equal distance from previous prime (663239) and next prime (663241).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2644 + ... + 2883.

It is an arithmetic number, because the mean of its divisors is an integer number (62190).

2⁶⁶³²⁴⁰ is an apocalyptic number.

663240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663240 is an abundant number, since it is smaller than the sum of its proper divisors (1326840).

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

663240 is a wasteful number, since it uses less digits than its factorization.

663240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5541 (or 5537 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 663240 is about 814.3954813234. The cubic root of 663240 is about 87.2081158454.

It can be divided in two parts, 663 and 240, that added together give a triangular number (903 = T₄₂).

The spelling of 663240 in words is "six hundred sixty-three thousand, two hundred forty".