620435309 has 16 divisors (see below), whose sum is σ = 692420400. Its totient is φ = 551986176.

The previous prime is 620435273. The next prime is 620435311. The reversal of 620435309 is 903534026.

It can be written as a sum of positive squares in 8 ways, for example, as 184878409 + 435556900 = 13597^2 + 20870^2 .

It is a cyclic number.

It is not a de Polignac number, because 620435309 - 2¹² = 620431213 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 (620435339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290357 + ... + 292485.

It is an arithmetic number, because the mean of its divisors is an integer number (43276275).

Almost surely, 2^620435309 is an apocalyptic number.

It is an amenable number.

620435309 is a deficient number, since it is larger than the sum of its proper divisors (71985091).

620435309 is a wasteful number, since it uses less digits than its factorization.

620435309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 620435309 is about 24908.5388772605. The cubic root of 620435309 is about 852.9014155177.

The spelling of 620435309 in words is "six hundred twenty million, four hundred thirty-five thousand, three hundred nine".