861248765 has 16 divisors (see below), whose sum is σ = 1115079168. Its totient is φ = 634810176.

The previous prime is 861248761. The next prime is 861248771. The reversal of 861248765 is 567842168.

It is not a de Polignac number, because 861248765 - 2² = 861248761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861248761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23444 + ... + 47666.

It is an arithmetic number, because the mean of its divisors is an integer number (69692448).

Almost surely, 2^861248765 is an apocalyptic number.

It is an amenable number.

861248765 is a deficient number, since it is larger than the sum of its proper divisors (253830403).

861248765 is a wasteful number, since it uses less digits than its factorization.

861248765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24788.

The product of its digits is 645120, while the sum is 47.

The square root of 861248765 is about 29347.0401403617. The cubic root of 861248765 is about 951.4286040599.

The spelling of 861248765 in words is "eight hundred sixty-one million, two hundred forty-eight thousand, seven hundred sixty-five".