641662847 has 8 divisors (see below), whose sum is σ = 748932096. Its totient is φ = 538294392.

The previous prime is 641662837. The next prime is 641662867. The reversal of 641662847 is 748266146.

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

It is a cyclic number.

It is not a de Polignac number, because 641662847 - 2⁶ = 641662783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641662798 and 641662807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641662817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974843 + ... + 975500.

It is an arithmetic number, because the mean of its divisors is an integer number (93616512).

Almost surely, 2^641662847 is an apocalyptic number.

641662847 is a deficient number, since it is larger than the sum of its proper divisors (107269249).

641662847 is a wasteful number, since it uses less digits than its factorization.

641662847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950397.

The product of its digits is 387072, while the sum is 44.

The square root of 641662847 is about 25331.0648611542. The cubic root of 641662847 is about 862.5195837323.

The spelling of 641662847 in words is "six hundred forty-one million, six hundred sixty-two thousand, eight hundred forty-seven".