646464505 has 8 divisors (see below), whose sum is σ = 785577600. Its totient is φ = 510624816.

The previous prime is 646464439. The next prime is 646464517. The reversal of 646464505 is 505464646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646464505 - 2²³ = 638075897 is a prime.

It is a zygodrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817915 + ... + 818704.

It is an arithmetic number, because the mean of its divisors is an integer number (98197200).

Almost surely, 2^646464505 is an apocalyptic number.

It is an amenable number.

646464505 is a deficient number, since it is larger than the sum of its proper divisors (139113095).

646464505 is a wasteful number, since it uses less digits than its factorization.

646464505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636703.

The product of its (nonzero) digits is 345600, while the sum is 40.

The square root of 646464505 is about 25425.6662646232. Note that the first 3 decimals coincide. The cubic root of 646464505 is about 864.6656932596.

The spelling of 646464505 in words is "six hundred forty-six million, four hundred sixty-four thousand, five hundred five".