668577888 has 240 divisors, whose sum is σ = 2173469760. Its totient is φ = 199929600.

The previous prime is 668577859. The next prime is 668577893. The reversal of 668577888 is 888775866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3734983 + ... + 3735161.

It is an arithmetic number, because the mean of its divisors is an integer number (9056124).

Almost surely, 2^668577888 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 668577888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086734880).

668577888 is an abundant number, since it is smaller than the sum of its proper divisors (1504891872).

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

668577888 is a wasteful number, since it uses less digits than its factorization.

668577888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 326 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The square root of 668577888 is about 25856.8731288221. The cubic root of 668577888 is about 874.4144710683.

It can be divided in two parts, 6685778 and 88, that added together give a palindrome (6685866).

The spelling of 668577888 in words is "six hundred sixty-eight million, five hundred seventy-seven thousand, eight hundred eighty-eight".