666480 has 40 divisors (see below), whose sum is σ = 2066832. Its totient is φ = 177664.

The previous prime is 666467. The next prime is 666493. The reversal of 666480 is 84666.

666480 = T₈₇ + T₈₈ + ... + T₁₆₆.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666467) and next prime (666493).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

666480 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1149 + ... + 1628.

2⁶⁶⁶⁴⁸⁰ is an apocalyptic number.

666480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666480 is an abundant number, since it is smaller than the sum of its proper divisors (1400352).

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

666480 is a wasteful number, since it uses less digits than its factorization.

666480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793 (or 2787 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 666480 is about 816.3822634036. The cubic root of 666480 is about 87.3498922949.

The spelling of 666480 in words is "six hundred sixty-six thousand, four hundred eighty".