665285040 has 120 divisors (see below), whose sum is σ = 2553446688. Its totient is φ = 152064000.

The previous prime is 665284999. The next prime is 665285041. The reversal of 665285040 is 40582566.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a junction number, because it is equal to n+sod(n) for n = 665284986 and 665285004.

It is not an unprimeable number, because it can be changed into a prime (665285041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60961 + ... + 71040.

Almost surely, 2^665285040 is an apocalyptic number.

665285040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665285040 is an abundant number, since it is smaller than the sum of its proper divisors (1888161648).

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

665285040 is a wasteful number, since it uses less digits than its factorization.

665285040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132027 (or 132018 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 665285040 is about 25793.1200129027. The cubic root of 665285040 is about 872.9765663301.

The spelling of 665285040 in words is "six hundred sixty-five million, two hundred eighty-five thousand, forty".