617720313 has 48 divisors (see below), whose sum is σ = 1021797504. Its totient is φ = 329817600.

The previous prime is 617720303. The next prime is 617720321. The reversal of 617720313 is 313027716.

It is not a de Polignac number, because 617720313 - 2⁴ = 617720297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (617720303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 376531 + ... + 378167.

It is an arithmetic number, because the mean of its divisors is an integer number (21287448).

Almost surely, 2^617720313 is an apocalyptic number.

It is an amenable number.

617720313 is a deficient number, since it is larger than the sum of its proper divisors (404077191).

617720313 is a wasteful number, since it uses less digits than its factorization.

617720313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 617720313 is about 24853.9798221532. The cubic root of 617720313 is about 851.6555107898.

The spelling of 617720313 in words is "six hundred seventeen million, seven hundred twenty thousand, three hundred thirteen".