861660700 has 72 divisors (see below), whose sum is σ = 1902541424. Its totient is φ = 338688000.

The previous prime is 861660689. The next prime is 861660719. The reversal of 861660700 is 7066168.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 2046490 + ... + 2046910.

Almost surely, 2^861660700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861660700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951270712).

861660700 is an abundant number, since it is smaller than the sum of its proper divisors (1040880724).

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

861660700 is a wasteful number, since it uses less digits than its factorization.

861660700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 861660700 is about 29354.0576411507. The cubic root of 861660700 is about 951.5802692111.

The spelling of 861660700 in words is "eight hundred sixty-one million, six hundred sixty thousand, seven hundred".