668240280 has 96 divisors (see below), whose sum is σ = 2252250000. Its totient is φ = 178194816.

The previous prime is 668240273. The next prime is 668240311. The reversal of 668240280 is 82042866.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24655 + ... + 44094.

Almost surely, 2^668240280 is an apocalyptic number.

668240280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668240280 is an abundant number, since it is smaller than the sum of its proper divisors (1584009720).

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

668240280 is a wasteful number, since it uses less digits than its factorization.

668240280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68775 (or 68759 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 668240280 is about 25850.3439048690. The cubic root of 668240280 is about 874.2672635750.

The spelling of 668240280 in words is "six hundred sixty-eight million, two hundred forty thousand, two hundred eighty".