668669952 has 96 divisors (see below), whose sum is σ = 1824863040. Its totient is φ = 217620480.

The previous prime is 668669941. The next prime is 668670017. The reversal of 668669952 is 259966866.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 668669892 and 668669901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262927 + ... + 265457.

It is an arithmetic number, because the mean of its divisors is an integer number (19008990).

Almost surely, 2^668669952 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 668669952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912431520).

668669952 is an abundant number, since it is smaller than the sum of its proper divisors (1156193088).

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

668669952 is a wasteful number, since it uses less digits than its factorization.

668669952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599 (or 2579 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 57.

The square root of 668669952 is about 25858.6533292049. The cubic root of 668669952 is about 874.4546052099.

The spelling of 668669952 in words is "six hundred sixty-eight million, six hundred sixty-nine thousand, nine hundred fifty-two".