865655538 has 48 divisors (see below), whose sum is σ = 2014981920. Its totient is φ = 246885760.

The previous prime is 865655537. The next prime is 865655587. The reversal of 865655538 is 835556568.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (865655537) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 22728 + ... + 47411.

It is an arithmetic number, because the mean of its divisors is an integer number (41978790).

Almost surely, 2^865655538 is an apocalyptic number.

865655538 is an abundant number, since it is smaller than the sum of its proper divisors (1149326382).

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

865655538 is a wasteful number, since it uses less digits than its factorization.

865655538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70183 (or 70172 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 51.

The square root of 865655538 is about 29422.0247093908. The cubic root of 865655538 is about 953.0485770175.

The spelling of 865655538 in words is "eight hundred sixty-five million, six hundred fifty-five thousand, five hundred thirty-eight".