668378532 has 24 divisors (see below), whose sum is σ = 1560437536. Its totient is φ = 222666048.

The previous prime is 668378531. The next prime is 668378539. The reversal of 668378532 is 235873866.

It is not an unprimeable number, because it can be changed into a prime (668378531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7488 + ... + 37320.

Almost surely, 2^668378532 is an apocalyptic number.

It is an amenable number.

668378532 is an abundant number, since it is smaller than the sum of its proper divisors (892059004).

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

668378532 is a wasteful number, since it uses less digits than its factorization.

668378532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31707 (or 31705 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 668378532 is about 25853.0178509202. The cubic root of 668378532 is about 874.3275517013.

The spelling of 668378532 in words is "six hundred sixty-eight million, three hundred seventy-eight thousand, five hundred thirty-two".