849217644 has 36 divisors (see below), whose sum is σ = 2341783080. Its totient is φ = 257338560.

The previous prime is 849217613. The next prime is 849217703. The reversal of 849217644 is 446712948.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 849217644.

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 11 ways as a sum of consecutive naturals, for example, 1071849 + ... + 1072640.

It is an arithmetic number, because the mean of its divisors is an integer number (65049530).

Almost surely, 2^849217644 is an apocalyptic number.

It is an amenable number.

849217644 is an abundant number, since it is smaller than the sum of its proper divisors (1492565436).

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

849217644 is a wasteful number, since it uses less digits than its factorization.

849217644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144510 (or 2144505 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 849217644 is about 29141.3390907144. The cubic root of 849217644 is about 946.9775201350.

The spelling of 849217644 in words is "eight hundred forty-nine million, two hundred seventeen thousand, six hundred forty-four".