865144428730 has 16 divisors (see below), whose sum is σ = 1557271019304. Its totient is φ = 346055316480.

The previous prime is 865144428689. The next prime is 865144428739. The reversal of 865144428730 is 37824441568.

It can be written as a sum of positive squares in 4 ways, for example, as 831961070161 + 33183358569 = 912119^2 + 182163^2 .

It is not an unprimeable number, because it can be changed into a prime (865144428739) 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 7 ways as a sum of consecutive naturals, for example, 1996414 + ... + 2390806.

Almost surely, 2^865144428730 is an apocalyptic number.

865144428730 is a deficient number, since it is larger than the sum of its proper divisors (692126590574).

865144428730 is a wasteful number, since it uses less digits than its factorization.

865144428730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613761.

The product of its (nonzero) digits is 5160960, while the sum is 52.

The spelling of 865144428730 in words is "eight hundred sixty-five billion, one hundred forty-four million, four hundred twenty-eight thousand, seven hundred thirty".