665020460 has 96 divisors (see below), whose sum is σ = 1574899200. Its totient is φ = 234178560.

The previous prime is 665020453. The next prime is 665020469. The reversal of 665020460 is 64020566.

It is a super-2 number, since 2×665020460² = 884504424437223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (665020469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 670565 + ... + 671555.

It is an arithmetic number, because the mean of its divisors is an integer number (16405200).

Almost surely, 2^665020460 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 665020460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787449600).

665020460 is an abundant number, since it is smaller than the sum of its proper divisors (909878740).

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

665020460 is a wasteful number, since it uses less digits than its factorization.

665020460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 665020460 is about 25787.9906157886. The cubic root of 665020460 is about 872.8608250806.

The spelling of 665020460 in words is "six hundred sixty-five million, twenty thousand, four hundred sixty".