665494288 has 40 divisors (see below), whose sum is σ = 1345835736. Its totient is φ = 318489600.

The previous prime is 665494243. The next prime is 665494303. The reversal of 665494288 is 882494566.

It can be written as a sum of positive squares in 4 ways, for example, as 40094224 + 625400064 = 6332^2 + 25008^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25198 + ... + 44338.

Almost surely, 2^665494288 is an apocalyptic number.

It is an amenable number.

665494288 is an abundant number, since it is smaller than the sum of its proper divisors (680341448).

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

665494288 is a wasteful number, since it uses less digits than its factorization.

665494288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19243 (or 19237 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 52.

The square root of 665494288 is about 25797.1759694739. The cubic root of 665494288 is about 873.0680807145.

The spelling of 665494288 in words is "six hundred sixty-five million, four hundred ninety-four thousand, two hundred eighty-eight".