660288407 has 4 divisors (see below), whose sum is σ = 663051360. Its totient is φ = 657525456.

The previous prime is 660288403. The next prime is 660288451. The reversal of 660288407 is 704882066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660288407 - 2² = 660288403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660288403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381118 + ... + 1381595.

It is an arithmetic number, because the mean of its divisors is an integer number (165762840).

Almost surely, 2^660288407 is an apocalyptic number.

660288407 is a deficient number, since it is larger than the sum of its proper divisors (2762953).

660288407 is a wasteful number, since it uses less digits than its factorization.

660288407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762952.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 660288407 is about 25696.0776578839. The cubic root of 660288407 is about 870.7855708934.

The spelling of 660288407 in words is "six hundred sixty million, two hundred eighty-eight thousand, four hundred seven".