668440480 has 24 divisors (see below), whose sum is σ = 1579191012. Its totient is φ = 267376128.

The previous prime is 668440477. The next prime is 668440499. The reversal of 668440480 is 84044866.

It can be written as a sum of positive squares in 2 ways, for example, as 667085584 + 1354896 = 25828^2 + 1164^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2088717 + ... + 2089036.

Almost surely, 2^668440480 is an apocalyptic number.

It is an amenable number.

668440480 is an abundant number, since it is smaller than the sum of its proper divisors (910750532).

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

668440480 is a wasteful number, since it uses less digits than its factorization.

668440480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177768 (or 4177760 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 668440480 is about 25854.2159037941. The cubic root of 668440480 is about 874.3545629269.

The spelling of 668440480 in words is "six hundred sixty-eight million, four hundred forty thousand, four hundred eighty".