861664710 has 16 divisors (see below), whose sum is σ = 2067995376. Its totient is φ = 229777248.

The previous prime is 861664697. The next prime is 861664721. The reversal of 861664710 is 17466168.

It is a happy number.

It is a super-3 number, since 3×861664710³ (a number of 28 digits) contains 333 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 14361049 + ... + 14361108.

It is an arithmetic number, because the mean of its divisors is an integer number (129249711).

Almost surely, 2^861664710 is an apocalyptic number.

861664710 is an abundant number, since it is smaller than the sum of its proper divisors (1206330666).

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

861664710 is a wasteful number, since it uses less digits than its factorization.

861664710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28722167.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 861664710 is about 29354.1259450865. The cubic root of 861664710 is about 951.5817453648.

The spelling of 861664710 in words is "eight hundred sixty-one million, six hundred sixty-four thousand, seven hundred ten".