668019528 has 64 divisors (see below), whose sum is σ = 2024308800. Its totient is φ = 202429440.

The previous prime is 668019523. The next prime is 668019533. The reversal of 668019528 is 825910866.

It is an interprime number because it is at equal distance from previous prime (668019523) and next prime (668019533).

It is not an unprimeable number, because it can be changed into a prime (668019523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138201 + ... + 142952.

It is an arithmetic number, because the mean of its divisors is an integer number (31629825).

Almost surely, 2^668019528 is an apocalyptic number.

It is an amenable number.

668019528 is an abundant number, since it is smaller than the sum of its proper divisors (1356289272).

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

668019528 is a wasteful number, since it uses less digits than its factorization.

668019528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281179 (or 281169 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 668019528 is about 25846.0737443814. The cubic root of 668019528 is about 874.1709820883.

The spelling of 668019528 in words is "six hundred sixty-eight million, nineteen thousand, five hundred twenty-eight".