620666660 has 24 divisors (see below), whose sum is σ = 1319902080. Its totient is φ = 245123424.

The previous prime is 620666647. The next prime is 620666677. The reversal of 620666660 is 66666026.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194834 + ... + 197993.

It is an arithmetic number, because the mean of its divisors is an integer number (54995920).

Almost surely, 2^620666660 is an apocalyptic number.

It is an amenable number.

620666660 is an abundant number, since it is smaller than the sum of its proper divisors (699235420).

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

620666660 is a wasteful number, since it uses less digits than its factorization.

620666660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392915 (or 392913 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 620666660 is about 24913.1824542751. The cubic root of 620666660 is about 853.0074137160.

The spelling of 620666660 in words is "six hundred twenty million, six hundred sixty-six thousand, six hundred sixty".