620755559 has 4 divisors (see below), whose sum is σ = 626782416. Its totient is φ = 614728704.

The previous prime is 620755543. The next prime is 620755613. The reversal of 620755559 is 955557026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955557026 = 2 ⋅477778513.

It is a cyclic number.

It is not a de Polignac number, because 620755559 - 2⁴ = 620755543 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 (620755519) 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, 3013274 + ... + 3013479.

It is an arithmetic number, because the mean of its divisors is an integer number (156695604).

Almost surely, 2^620755559 is an apocalyptic number.

620755559 is a deficient number, since it is larger than the sum of its proper divisors (6026857).

620755559 is a wasteful number, since it uses less digits than its factorization.

620755559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6026856.

The product of its (nonzero) digits is 472500, while the sum is 44.

The square root of 620755559 is about 24914.9665663031. The cubic root of 620755559 is about 853.0481376078.

The spelling of 620755559 in words is "six hundred twenty million, seven hundred fifty-five thousand, five hundred fifty-nine".