861247266 has 24 divisors (see below), whose sum is σ = 1893322032. Its totient is φ = 260983800.

The previous prime is 861247243. The next prime is 861247273. The reversal of 861247266 is 662742168.

861247266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 592420 + ... + 593871.

It is an arithmetic number, because the mean of its divisors is an integer number (78888418).

Almost surely, 2^861247266 is an apocalyptic number.

861247266 is an abundant number, since it is smaller than the sum of its proper divisors (1032074766).

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

861247266 is a wasteful number, since it uses less digits than its factorization.

861247266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186318 (or 1186307 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 861247266 is about 29347.0146011481. The cubic root of 861247266 is about 951.4280520737.

The spelling of 861247266 in words is "eight hundred sixty-one million, two hundred forty-seven thousand, two hundred sixty-six".