646779062 has 8 divisors (see below), whose sum is σ = 970347600. Its totient is φ = 323329864.

The previous prime is 646779061. The next prime is 646779101. The reversal of 646779062 is 260977646.

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

It is a junction number, because it is equal to n+sod(n) for n = 646778998 and 646779016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646779061) by changing a digit.

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, 14762 + ... + 38877.

It is an arithmetic number, because the mean of its divisors is an integer number (121293450).

Almost surely, 2^646779062 is an apocalyptic number.

646779062 is a deficient number, since it is larger than the sum of its proper divisors (323568538).

646779062 is a wasteful number, since it uses less digits than its factorization.

646779062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59670.

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 646779062 is about 25431.8513285997. The cubic root of 646779062 is about 864.8059136645.

The spelling of 646779062 in words is "six hundred forty-six million, seven hundred seventy-nine thousand, sixty-two".