861085270 has 32 divisors (see below), whose sum is σ = 1629745920. Its totient is φ = 326932320.

The previous prime is 861085217. The next prime is 861085271. The reversal of 861085270 is 72580168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861085271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15841 + ... + 44419.

It is an arithmetic number, because the mean of its divisors is an integer number (50929560).

Almost surely, 2^861085270 is an apocalyptic number.

861085270 is a deficient number, since it is larger than the sum of its proper divisors (768660650).

861085270 is a wasteful number, since it uses less digits than its factorization.

861085270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28740.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 861085270 is about 29344.2544631824. The cubic root of 861085270 is about 951.3683954921.

It can be divided in two parts, 86108 and 5270, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 861085270 in words is "eight hundred sixty-one million, eighty-five thousand, two hundred seventy".