646809416 has 16 divisors (see below), whose sum is σ = 1323019440. Its totient is φ = 294004240.

The previous prime is 646809407. The next prime is 646809433. The reversal of 646809416 is 614908646.

It is a super-2 number, since 2×646809416² = 836724841252522112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 3674966 + ... + 3675141.

It is an arithmetic number, because the mean of its divisors is an integer number (82688715).

Almost surely, 2^646809416 is an apocalyptic number.

It is an amenable number.

646809416 is an abundant number, since it is smaller than the sum of its proper divisors (676210024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646809416 is a wasteful number, since it uses less digits than its factorization.

646809416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7350124 (or 7350120 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 646809416 is about 25432.4480929383. The cubic root of 646809416 is about 864.8194421936.

The spelling of 646809416 in words is "six hundred forty-six million, eight hundred nine thousand, four hundred sixteen".