668123448 has 64 divisors (see below), whose sum is σ = 1782393600. Its totient is φ = 208085760.

The previous prime is 668123411. The next prime is 668123473. The reversal of 668123448 is 844321866.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23253 + ... + 43323.

It is an arithmetic number, because the mean of its divisors is an integer number (27849900).

Almost surely, 2^668123448 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 668123448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891196800).

668123448 is an abundant number, since it is smaller than the sum of its proper divisors (1114270152).

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

668123448 is a wasteful number, since it uses less digits than its factorization.

668123448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20172 (or 20168 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 668123448 is about 25848.0840295756. The cubic root of 668123448 is about 874.2163096745.

The spelling of 668123448 in words is "six hundred sixty-eight million, one hundred twenty-three thousand, four hundred forty-eight".