617440321 has 8 divisors (see below), whose sum is σ = 651744800. Its totient is φ = 584936964.

The previous prime is 617440297. The next prime is 617440331. The reversal of 617440321 is 123044716.

It is not a de Polignac number, because 617440321 - 2⁷ = 617440193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 617440321.

It is not an unprimeable number, because it can be changed into a prime (617440331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38151 + ... + 51868.

It is an arithmetic number, because the mean of its divisors is an integer number (81468100).

Almost surely, 2^617440321 is an apocalyptic number.

It is an amenable number.

617440321 is a deficient number, since it is larger than the sum of its proper divisors (34304479).

617440321 is an frugal number, since it uses more digits than its factorization.

617440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90076 (or 90038 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 617440321 is about 24848.3464439789. The cubic root of 617440321 is about 851.5268156711.

The spelling of 617440321 in words is "six hundred seventeen million, four hundred forty thousand, three hundred twenty-one".