620393509 has 4 divisors (see below), whose sum is σ = 635525100. Its totient is φ = 605261920.

The previous prime is 620393503. The next prime is 620393519. The reversal of 620393509 is 905393026.

620393509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905393026 = 2 ⋅452696513.

It can be written as a sum of positive squares in 2 ways, for example, as 22591009 + 597802500 = 4753^2 + 24450^2 .

It is a cyclic number.

It is not a de Polignac number, because 620393509 - 2⁷ = 620393381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620393503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7565734 + ... + 7565815.

It is an arithmetic number, because the mean of its divisors is an integer number (158881275).

Almost surely, 2^620393509 is an apocalyptic number.

It is an amenable number.

620393509 is a deficient number, since it is larger than the sum of its proper divisors (15131591).

620393509 is a wasteful number, since it uses less digits than its factorization.

620393509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15131590.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 620393509 is about 24907.6997934374. The cubic root of 620393509 is about 852.8822611813.

The spelling of 620393509 in words is "six hundred twenty million, three hundred ninety-three thousand, five hundred nine".