865747872 has 192 divisors, whose sum is σ = 2795627520. Its totient is φ = 258451200.

The previous prime is 865747859. The next prime is 865747877. The reversal of 865747872 is 278747568.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (865747877) 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 31 ways as a sum of consecutive naturals, for example, 674143 + ... + 675425.

It is an arithmetic number, because the mean of its divisors is an integer number (14560560).

Almost surely, 2^865747872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865747872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1397813760).

865747872 is an abundant number, since it is smaller than the sum of its proper divisors (1929879648).

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

865747872 is a wasteful number, since it uses less digits than its factorization.

865747872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 1370 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 54.

The square root of 865747872 is about 29423.5937981750. The cubic root of 865747872 is about 953.0824610337.

The spelling of 865747872 in words is "eight hundred sixty-five million, seven hundred forty-seven thousand, eight hundred seventy-two".