850649805 has 24 divisors (see below), whose sum is σ = 1475929728. Its totient is φ = 453227616.

The previous prime is 850649797. The next prime is 850649831. The reversal of 850649805 is 508946058.

It is not a de Polignac number, because 850649805 - 2³ = 850649797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 38944 + ... + 56726.

It is an arithmetic number, because the mean of its divisors is an integer number (61497072).

Almost surely, 2^850649805 is an apocalyptic number.

It is an amenable number.

850649805 is a deficient number, since it is larger than the sum of its proper divisors (625279923).

850649805 is a wasteful number, since it uses less digits than its factorization.

850649805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18857 (or 18854 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 850649805 is about 29165.9014090084. The cubic root of 850649805 is about 947.5095637931.

It can be divided in two parts, 8506 and 49805, that added together give a triangular number (58311 = T₃₄₁).

The spelling of 850649805 in words is "eight hundred fifty million, six hundred forty-nine thousand, eight hundred five".