646839546 has 8 divisors (see below), whose sum is σ = 1293679104. Its totient is φ = 215613180.

The previous prime is 646839541. The next prime is 646839559. The reversal of 646839546 is 645938646.

It is a happy number.

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

646839546 is an admirable number.

It is a super-2 number, since 2×646839546² = 836802796538972232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646839541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53903290 + ... + 53903301.

It is an arithmetic number, because the mean of its divisors is an integer number (161709888).

Almost surely, 2^646839546 is an apocalyptic number.

646839546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646839546 is a wasteful number, since it uses less digits than its factorization.

646839546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107806596.

The product of its digits is 3732480, while the sum is 51.

The square root of 646839546 is about 25433.0404395542. The cubic root of 646839546 is about 864.8328704692.

The spelling of 646839546 in words is "six hundred forty-six million, eight hundred thirty-nine thousand, five hundred forty-six".