617122220 has 96 divisors (see below), whose sum is σ = 1555255296. Its totient is φ = 202694400.

The previous prime is 617122211. The next prime is 617122237. The reversal of 617122220 is 22221716.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132125 + ... + 136715.

It is an arithmetic number, because the mean of its divisors is an integer number (16200576).

Almost surely, 2^617122220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 617122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777627648).

617122220 is an abundant number, since it is smaller than the sum of its proper divisors (938133076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

617122220 is a wasteful number, since it uses less digits than its factorization.

617122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671 (or 4669 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 617122220 is about 24841.9447708910. The cubic root of 617122220 is about 851.3805569679.

Adding to 617122220 its reverse (22221716), we get a palindrome (639343936).

The spelling of 617122220 in words is "six hundred seventeen million, one hundred twenty-two thousand, two hundred twenty".