865990572 has 48 divisors (see below), whose sum is σ = 2123761920. Its totient is φ = 274114368.

The previous prime is 865990519. The next prime is 865990579. The reversal of 865990572 is 275099568.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (865990579) 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, 27078 + ... + 49650.

It is an arithmetic number, because the mean of its divisors is an integer number (44245040).

Almost surely, 2^865990572 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 865990572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061880960).

865990572 is an abundant number, since it is smaller than the sum of its proper divisors (1257771348).

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

865990572 is a wasteful number, since it uses less digits than its factorization.

865990572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22742 (or 22740 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 51.

The square root of 865990572 is about 29427.7177504475. The cubic root of 865990572 is about 953.1715137125.

The spelling of 865990572 in words is "eight hundred sixty-five million, nine hundred ninety thousand, five hundred seventy-two".