620666 has 4 divisors (see below), whose sum is σ = 931002. Its totient is φ = 310332.

The previous prime is 620663. The next prime is 620671. The reversal of 620666 is 666026.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 137641 = 695^2 + 371^2 .

620666 is a modest number, since divided by 666 gives 620 as remainder.

It is not an unprimeable number, because it can be changed into a prime (620663) by changing a digit.

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 as a sum of consecutive naturals, namely, 155165 + ... + 155168.

2⁶²⁰⁶⁶⁶ is an apocalyptic number.

620666 is a deficient number, since it is larger than the sum of its proper divisors (310336).

620666 is a wasteful number, since it uses less digits than its factorization.

620666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310335.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 620666 is about 787.8235843131. The cubic root of 620666 is about 85.3007111361.

The spelling of 620666 in words is "six hundred twenty thousand, six hundred sixty-six".