861235728 has 40 divisors (see below), whose sum is σ = 2226048000. Its totient is φ = 286925184.

The previous prime is 861235723. The next prime is 861235729. The reversal of 861235728 is 827532168.

It is a self number, because there is not a number n which added to its sum of digits gives 861235728.

It is not an unprimeable number, because it can be changed into a prime (861235723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118833 + ... + 125871.

It is an arithmetic number, because the mean of its divisors is an integer number (55651200).

Almost surely, 2^861235728 is an apocalyptic number.

It is an amenable number.

861235728 is an abundant number, since it is smaller than the sum of its proper divisors (1364812272).

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

861235728 is a wasteful number, since it uses less digits than its factorization.

861235728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9599 (or 9593 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 861235728 is about 29346.8180217209. The cubic root of 861235728 is about 951.4238033419.

The spelling of 861235728 in words is "eight hundred sixty-one million, two hundred thirty-five thousand, seven hundred twenty-eight".