3872645646 has 8 divisors (see below), whose sum is σ = 7745291304. Its totient is φ = 1290881880.

The previous prime is 3872645641. The next prime is 3872645657. The reversal of 3872645646 is 6465462783.

It is a happy number.

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

3872645646 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3872645641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322720465 + ... + 322720476.

It is an arithmetic number, because the mean of its divisors is an integer number (968161413).

Almost surely, 2^3872645646 is an apocalyptic number.

3872645646 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.

3872645646 is a wasteful number, since it uses less digits than its factorization.

3872645646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645440946.

The product of its digits is 5806080, while the sum is 51.

The square root of 3872645646 is about 62230.5844902649. The cubic root of 3872645646 is about 1570.3721575733.

The spelling of 3872645646 in words is "three billion, eight hundred seventy-two million, six hundred forty-five thousand, six hundred forty-six".