865822650 has 144 divisors (see below), whose sum is σ = 2725138080. Its totient is φ = 179894400.

The previous prime is 865822577. The next prime is 865822663. The reversal of 865822650 is 56228568.

It is a super-2 number, since 2×865822650² = 1499297722506045000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 75496 + ... + 86204.

It is an arithmetic number, because the mean of its divisors is an integer number (18924570).

Almost surely, 2^865822650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865822650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1362569040).

865822650 is an abundant number, since it is smaller than the sum of its proper divisors (1859315430).

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

865822650 is a wasteful number, since it uses less digits than its factorization.

865822650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749 (or 10737 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 865822650 is about 29424.8644856693. The cubic root of 865822650 is about 953.1099007193.

The spelling of 865822650 in words is "eight hundred sixty-five million, eight hundred twenty-two thousand, six hundred fifty".