663471 has 10 divisors (see below), whose sum is σ = 991232. Its totient is φ = 442260.

The previous prime is 663463. The next prime is 663517. The reversal of 663471 is 174366.

It is not a de Polignac number, because 663471 - 2³ = 663463 is a prime.

It is a super-3 number, since 3×663471³ = 876167398029708333, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4015 + ... + 4176.

2⁶⁶³⁴⁷¹ is an apocalyptic number.

663471 is a deficient number, since it is larger than the sum of its proper divisors (327761).

663471 is an equidigital number, since it uses as much as digits as its factorization.

663471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8203 (or 8194 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 663471 is about 814.5372919640. The cubic root of 663471 is about 87.2182392479.

The spelling of 663471 in words is "six hundred sixty-three thousand, four hundred seventy-one".