620643646 has 32 divisors (see below), whose sum is σ = 1097644032. Its totient is φ = 257700960.

The previous prime is 620643641. The next prime is 620643689. The reversal of 620643646 is 646346026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620643641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 51795 + ... + 62641.

It is an arithmetic number, because the mean of its divisors is an integer number (34301376).

Almost surely, 2^620643646 is an apocalyptic number.

620643646 is a deficient number, since it is larger than the sum of its proper divisors (477000386).

620643646 is a wasteful number, since it uses less digits than its factorization.

620643646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10984.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 620643646 is about 24912.7205660080. The cubic root of 620643646 is about 852.9968705605.

The spelling of 620643646 in words is "six hundred twenty million, six hundred forty-three thousand, six hundred forty-six".