663672 has 16 divisors (see below), whose sum is σ = 1659240. Its totient is φ = 221216.

The previous prime is 663661. The next prime is 663683. The reversal of 663672 is 276366.

It is an interprime number because it is at equal distance from previous prime (663661) and next prime (663683).

It is a congruent number.

It is an unprimeable number.

663672 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13803 + ... + 13850.

2⁶⁶³⁶⁷² is an apocalyptic number.

It is an amenable number.

663672 is an abundant number, since it is smaller than the sum of its proper divisors (995568).

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

663672 is a wasteful number, since it uses less digits than its factorization.

663672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27662 (or 27658 counting only the distinct ones).

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

The square root of 663672 is about 814.6606655535. The cubic root of 663672 is about 87.2270460111.

The spelling of 663672 in words is "six hundred sixty-three thousand, six hundred seventy-two".