865049328 has 480 divisors, whose sum is σ = 3140076800. Its totient is φ = 225815040.

The previous prime is 865049293. The next prime is 865049333. The reversal of 865049328 is 823940568.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12911151 + ... + 12911217.

Almost surely, 2^865049328 is an apocalyptic number.

865049328 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865049328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1570038400).

865049328 is an abundant number, since it is smaller than the sum of its proper divisors (2275027472).

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

865049328 is a wasteful number, since it uses less digits than its factorization.

865049328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 865049328 is about 29411.7209289086. The cubic root of 865049328 is about 952.8260549062.

The spelling of 865049328 in words is "eight hundred sixty-five million, forty-nine thousand, three hundred twenty-eight".