617881866 has 96 divisors (see below), whose sum is σ = 1477440000. Its totient is φ = 171708768.

The previous prime is 617881861. The next prime is 617881889. The reversal of 617881866 is 668188716.

It is not an unprimeable number, because it can be changed into a prime (617881861) 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, 3104835 + ... + 3105033.

It is an arithmetic number, because the mean of its divisors is an integer number (15390000).

Almost surely, 2^617881866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 617881866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738720000).

617881866 is an abundant number, since it is smaller than the sum of its proper divisors (859558134).

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

617881866 is a wasteful number, since it uses less digits than its factorization.

617881866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 449 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 617881866 is about 24857.2296525578. The cubic root of 617881866 is about 851.7297490857.

The spelling of 617881866 in words is "six hundred seventeen million, eight hundred eighty-one thousand, eight hundred sixty-six".