861306980 has 24 divisors (see below), whose sum is σ = 1831643520. Its totient is φ = 340161120.

The previous prime is 861306937. The next prime is 861307021. The reversal of 861306980 is 89603168.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270986 + ... + 274145.

It is an arithmetic number, because the mean of its divisors is an integer number (76318480).

Almost surely, 2^861306980 is an apocalyptic number.

It is an amenable number.

861306980 is an abundant number, since it is smaller than the sum of its proper divisors (970336540).

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

861306980 is a wasteful number, since it uses less digits than its factorization.

861306980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545219 (or 545217 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 861306980 is about 29348.0319612747. The cubic root of 861306980 is about 951.4500404402.

The spelling of 861306980 in words is "eight hundred sixty-one million, three hundred six thousand, nine hundred eighty".