861650836 has 12 divisors (see below), whose sum is σ = 1587251680. Its totient is φ = 408150360.

The previous prime is 861650821. The next prime is 861650837. The reversal of 861650836 is 638056168.

It is a junction number, because it is equal to n+sod(n) for n = 861650792 and 861650801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861650837) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5668680 + ... + 5668831.

Almost surely, 2^861650836 is an apocalyptic number.

It is an amenable number.

861650836 is a deficient number, since it is larger than the sum of its proper divisors (725600844).

861650836 is a wasteful number, since it uses less digits than its factorization.

861650836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11337534 (or 11337532 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 861650836 is about 29353.8896230125. The cubic root of 861650836 is about 951.5766380743.

The spelling of 861650836 in words is "eight hundred sixty-one million, six hundred fifty thousand, eight hundred thirty-six".