620440065 has 96 divisors (see below), whose sum is σ = 1327173120. Its totient is φ = 261854208.

The previous prime is 620440063. The next prime is 620440069. The reversal of 620440065 is 560044026.

It is a happy number.

It is not a de Polignac number, because 620440065 - 2¹ = 620440063 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620440061) by changing a digit.

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 in 95 ways as a sum of consecutive naturals, for example, 208629 + ... + 211581.

It is an arithmetic number, because the mean of its divisors is an integer number (13824720).

Almost surely, 2^620440065 is an apocalyptic number.

It is an amenable number.

620440065 is an abundant number, since it is smaller than the sum of its proper divisors (706733055).

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

620440065 is a wasteful number, since it uses less digits than its factorization.

620440065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023 (or 3020 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 620440065 is about 24908.6343463466. The cubic root of 620440065 is about 852.9035948418.

The spelling of 620440065 in words is "six hundred twenty million, four hundred forty thousand, sixty-five".