861685006 has 32 divisors (see below), whose sum is σ = 1608707520. Its totient is φ = 337049856.

The previous prime is 861684953. The next prime is 861685031. The reversal of 861685006 is 600586168.

It is a happy number.

It is a super-4 number, since 4×861685006⁴ (a number of 37 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861685006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10401 + ... + 42796.

It is an arithmetic number, because the mean of its divisors is an integer number (50272110).

Almost surely, 2^861685006 is an apocalyptic number.

861685006 is a deficient number, since it is larger than the sum of its proper divisors (747022514).

861685006 is a wasteful number, since it uses less digits than its factorization.

861685006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53308.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 861685006 is about 29354.4716525438. The cubic root of 861685006 is about 951.5892166202.

The spelling of 861685006 in words is "eight hundred sixty-one million, six hundred eighty-five thousand, six".