668676384 has 120 divisors (see below), whose sum is σ = 1985761008. Its totient is φ = 220717440.

The previous prime is 668676377. The next prime is 668676409. The reversal of 668676384 is 483676866.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 668676384.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 276139 + ... + 278549.

Almost surely, 2^668676384 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 668676384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992880504).

668676384 is an abundant number, since it is smaller than the sum of its proper divisors (1317084624).

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

668676384 is a wasteful number, since it uses less digits than its factorization.

668676384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540 (or 2523 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 668676384 is about 25858.7776973313. Note that the first 3 decimals coincide. The cubic root of 668676384 is about 874.4574090217.

The spelling of 668676384 in words is "six hundred sixty-eight million, six hundred seventy-six thousand, three hundred eighty-four".