620435261 has 4 divisors (see below), whose sum is σ = 634864032. Its totient is φ = 606006492.

The previous prime is 620435243. The next prime is 620435273. The reversal of 620435261 is 162534026.

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 620435261 - 2¹⁸ = 620173117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620437261) 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, 7214321 + ... + 7214406.

It is an arithmetic number, because the mean of its divisors is an integer number (158716008).

Almost surely, 2^620435261 is an apocalyptic number.

It is an amenable number.

620435261 is a deficient number, since it is larger than the sum of its proper divisors (14428771).

620435261 is a wasteful number, since it uses less digits than its factorization.

620435261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14428770.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 620435261 is about 24908.5379137355. The cubic root of 620435261 is about 852.9013935228.

Adding to 620435261 its reverse (162534026), we get a palindrome (782969287).

The spelling of 620435261 in words is "six hundred twenty million, four hundred thirty-five thousand, two hundred sixty-one".