667620 has 36 divisors (see below), whose sum is σ = 2025660. Its totient is φ = 177984.

The previous prime is 667577. The next prime is 667631. The reversal of 667620 is 26766.

667620 = T₂₄ + T₂₅ + ... + T₁₅₈.

It can be written as a sum of positive squares in 2 ways, for example, as 207936 + 459684 = 456^2 + 678^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1675 + ... + 2034.

2⁶⁶⁷⁶²⁰ is an apocalyptic number.

667620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667620 is an abundant number, since it is smaller than the sum of its proper divisors (1358040).

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

667620 is a wasteful number, since it uses less digits than its factorization.

667620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724 (or 3719 counting only the distinct ones).

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

The square root of 667620 is about 817.0801674254. The cubic root of 667620 is about 87.3996673095.

The spelling of 667620 in words is "six hundred sixty-seven thousand, six hundred twenty".