646240646 has 8 divisors (see below), whose sum is σ = 970288200. Its totient is φ = 322811248.

The previous prime is 646240633. The next prime is 646240687. The reversal of 646240646 is 646042646.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151916 + ... + 156111.

It is an arithmetic number, because the mean of its divisors is an integer number (121286025).

Almost surely, 2^646240646 is an apocalyptic number.

646240646 is a deficient number, since it is larger than the sum of its proper divisors (324047554).

646240646 is a wasteful number, since it uses less digits than its factorization.

646240646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309078.

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 646240646 is about 25421.2636585989. The cubic root of 646240646 is about 864.5658756916.

The spelling of 646240646 in words is "six hundred forty-six million, two hundred forty thousand, six hundred forty-six".