620257609 has 4 divisors (see below), whose sum is σ = 622449616. Its totient is φ = 618065604.

The previous prime is 620257607. The next prime is 620257639. The reversal of 620257609 is 906752026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620257609 - 2¹ = 620257607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620257607) 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 3 ways as a sum of consecutive naturals, for example, 1095579 + ... + 1096144.

It is an arithmetic number, because the mean of its divisors is an integer number (155612404).

Almost surely, 2^620257609 is an apocalyptic number.

It is an amenable number.

620257609 is a deficient number, since it is larger than the sum of its proper divisors (2192007).

620257609 is a wasteful number, since it uses less digits than its factorization.

620257609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192006.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 620257609 is about 24904.9715719573. The cubic root of 620257609 is about 852.8199807298.

The spelling of 620257609 in words is "six hundred twenty million, two hundred fifty-seven thousand, six hundred nine".