662706409 has 4 divisors (see below), whose sum is σ = 663345280. Its totient is φ = 662067540.

The previous prime is 662706391. The next prime is 662706413. The reversal of 662706409 is 904607266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 662706409 - 2¹³ = 662698217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (662706469) 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, 317877 + ... + 319954.

It is an arithmetic number, because the mean of its divisors is an integer number (165836320).

Almost surely, 2^662706409 is an apocalyptic number.

It is an amenable number.

662706409 is a deficient number, since it is larger than the sum of its proper divisors (638871).

662706409 is a wasteful number, since it uses less digits than its factorization.

662706409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638870.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 662706409 is about 25743.0846830756. The cubic root of 662706409 is about 871.8472262903.

The spelling of 662706409 in words is "six hundred sixty-two million, seven hundred six thousand, four hundred nine".