620780666 has 16 divisors (see below), whose sum is σ = 1016396640. Its totient is φ = 282013680.

The previous prime is 620780663. The next prime is 620780689. The reversal of 620780666 is 666087026.

It is not an unprimeable number, because it can be changed into a prime (620780663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37685 + ... + 51591.

It is an arithmetic number, because the mean of its divisors is an integer number (63524790).

Almost surely, 2^620780666 is an apocalyptic number.

620780666 is a deficient number, since it is larger than the sum of its proper divisors (395615974).

620780666 is a wasteful number, since it uses less digits than its factorization.

620780666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15949.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 620780666 is about 24915.4704149851. The cubic root of 620780666 is about 853.0596382114.

The spelling of 620780666 in words is "six hundred twenty million, seven hundred eighty thousand, six hundred sixty-six".