620644523 has 2 divisors, whose sum is σ = 620644524. Its totient is φ = 620644522.

The previous prime is 620644487. The next prime is 620644553. The reversal of 620644523 is 325446026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620644523 - 2⁸ = 620644267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620644523.

It is not a weakly prime, because it can be changed into another prime (620644553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310322261 + 310322262.

It is an arithmetic number, because the mean of its divisors is an integer number (310322262).

Almost surely, 2^620644523 is an apocalyptic number.

620644523 is a deficient number, since it is larger than the sum of its proper divisors (1).

620644523 is an equidigital number, since it uses as much as digits as its factorization.

620644523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 620644523 is about 24912.7381674516. The cubic root of 620644523 is about 852.9972723358.

The spelling of 620644523 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred twenty-three".