861727840 has 48 divisors (see below), whose sum is σ = 2054550960. Its totient is φ = 341521920.

The previous prime is 861727831. The next prime is 861727861. The reversal of 861727840 is 48727168.

861727840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent 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, 7266 + ... + 42145.

It is an arithmetic number, because the mean of its divisors is an integer number (42803145).

Almost surely, 2^861727840 is an apocalyptic number.

861727840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861727840 is an abundant number, since it is smaller than the sum of its proper divisors (1192823120).

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

861727840 is a wasteful number, since it uses less digits than its factorization.

861727840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49535 (or 49527 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 861727840 is about 29355.2012427100. The cubic root of 861727840 is about 951.6049840592.

The spelling of 861727840 in words is "eight hundred sixty-one million, seven hundred twenty-seven thousand, eight hundred forty".