665285472 has 36 divisors (see below), whose sum is σ = 1891906380. Its totient is φ = 221761728.

The previous prime is 665285449. The next prime is 665285473. The reversal of 665285472 is 274582566.

665285472 is a `hidden beast` number, since 6 + 6 + 528 + 54 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665285473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1154722 + ... + 1155297.

It is an arithmetic number, because the mean of its divisors is an integer number (52552955).

Almost surely, 2^665285472 is an apocalyptic number.

It is an amenable number.

665285472 is an abundant number, since it is smaller than the sum of its proper divisors (1226620908).

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

665285472 is a wasteful number, since it uses less digits than its factorization.

665285472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310035 (or 2310024 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 665285472 is about 25793.1283872275. The cubic root of 665285472 is about 872.9767552846.

The spelling of 665285472 in words is "six hundred sixty-five million, two hundred eighty-five thousand, four hundred seventy-two".