665340272 has 40 divisors (see below), whose sum is σ = 1361966400. Its totient is φ = 314354432.

The previous prime is 665340241. The next prime is 665340281. The reversal of 665340272 is 272043566.

It is a congruent number.

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, 6554 + ... + 37062.

It is an arithmetic number, because the mean of its divisors is an integer number (34049160).

Almost surely, 2^665340272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665340272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680983200).

665340272 is an abundant number, since it is smaller than the sum of its proper divisors (696626128).

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

665340272 is a wasteful number, since it uses less digits than its factorization.

665340272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30593 (or 30587 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 665340272 is about 25794.1906637909. The cubic root of 665340272 is about 873.0007238489. Note that the first 3 decimals are identical.

The spelling of 665340272 in words is "six hundred sixty-five million, three hundred forty thousand, two hundred seventy-two".