620641066 has 16 divisors (see below), whose sum is σ = 987505344. Its totient is φ = 291538624.

The previous prime is 620641057. The next prime is 620641081. The reversal of 620641066 is 660146026.

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, 2931 + ... + 35353.

It is an arithmetic number, because the mean of its divisors is an integer number (61719084).

Almost surely, 2^620641066 is an apocalyptic number.

620641066 is a deficient number, since it is larger than the sum of its proper divisors (366864278).

620641066 is a wasteful number, since it uses less digits than its factorization.

620641066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33005.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 620641066 is about 24912.6687851784. The cubic root of 620641066 is about 852.9956885967.

The spelling of 620641066 in words is "six hundred twenty million, six hundred forty-one thousand, sixty-six".