620613305 has 32 divisors (see below), whose sum is σ = 865305504. Its totient is φ = 423161856.

The previous prime is 620613293. The next prime is 620613341. The reversal of 620613305 is 503316026.

It can be written as a sum of positive squares in 16 ways, for example, as 257634601 + 362978704 = 16051^2 + 19052^2 .

It is a de Polignac number, because none of the positive numbers 2^k-620613305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53267 + ... + 63863.

It is an arithmetic number, because the mean of its divisors is an integer number (27040797).

Almost surely, 2^620613305 is an apocalyptic number.

620613305 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

620613305 is a deficient number, since it is larger than the sum of its proper divisors (244692199).

620613305 is a wasteful number, since it uses less digits than its factorization.

620613305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10685.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 620613305 is about 24912.1116126273. Note that the first 3 decimals coincide. The cubic root of 620613305 is about 852.9829703673.

The spelling of 620613305 in words is "six hundred twenty million, six hundred thirteen thousand, three hundred five".