3981625647 has 8 divisors (see below), whose sum is σ = 5480087040. Its totient is φ = 2568790680.

The previous prime is 3981625591. The next prime is 3981625651. The reversal of 3981625647 is 7465261893.

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

It is not a de Polignac number, because 3981625647 - 2⁸ = 3981625391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3981625647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981621647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21406497 + ... + 21406682.

It is an arithmetic number, because the mean of its divisors is an integer number (685010880).

Almost surely, 2^3981625647 is an apocalyptic number.

3981625647 is a deficient number, since it is larger than the sum of its proper divisors (1498461393).

3981625647 is a wasteful number, since it uses less digits than its factorization.

3981625647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42813213.

The product of its digits is 2177280, while the sum is 51.

The square root of 3981625647 is about 63100.1239856151. The cubic root of 3981625647 is about 1584.9666984084.

The spelling of 3981625647 in words is "three billion, nine hundred eighty-one million, six hundred twenty-five thousand, six hundred forty-seven".