620571664 has 10 divisors (see below), whose sum is σ = 1202357630. Its totient is φ = 310285824.

The previous prime is 620571631. The next prime is 620571701. The reversal of 620571664 is 466175026.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 590101264 + 30470400 = 24292^2 + 5520^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19392849 + ... + 19392880.

It is an arithmetic number, because the mean of its divisors is an integer number (120235763).

Almost surely, 2^620571664 is an apocalyptic number.

It is an amenable number.

620571664 is a deficient number, since it is larger than the sum of its proper divisors (581785966).

620571664 is a wasteful number, since it uses less digits than its factorization.

620571664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38785737 (or 38785731 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 620571664 is about 24911.2758404703. The cubic root of 620571664 is about 852.9638925411.

The spelling of 620571664 in words is "six hundred twenty million, five hundred seventy-one thousand, six hundred sixty-four".