861906320 has 40 divisors (see below), whose sum is σ = 2186110080. Its totient is φ = 313420160.

The previous prime is 861906289. The next prime is 861906337. The reversal of 861906320 is 23609168.

It is a tau number, because it is divible by the number of its divisors (40).

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, 488840 + ... + 490599.

It is an arithmetic number, because the mean of its divisors is an integer number (54652752).

Almost surely, 2^861906320 is an apocalyptic number.

861906320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861906320 is an abundant number, since it is smaller than the sum of its proper divisors (1324203760).

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

861906320 is a wasteful number, since it uses less digits than its factorization.

861906320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979463 (or 979457 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 861906320 is about 29358.2410917275. The cubic root of 861906320 is about 951.6706779380.

The spelling of 861906320 in words is "eight hundred sixty-one million, nine hundred six thousand, three hundred twenty".