90855866847728 has 20 divisors (see below), whose sum is σ = 183686861236368. Its totient is φ = 43452805883520.

The previous prime is 90855866847721. The next prime is 90855866847743. The reversal of 90855866847728 is 82774866855809.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90855866847721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123445470893 + ... + 123445471628.

Almost surely, 2^{90855866847728} is an apocalyptic number.

It is an amenable number.

90855866847728 is an abundant number, since it is smaller than the sum of its proper divisors (92830994388640).

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

90855866847728 is a wasteful number, since it uses less digits than its factorization.

90855866847728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246890942552 (or 246890942546 counting only the distinct ones).

The product of its (nonzero) digits is 13005619200, while the sum is 83.

The spelling of 90855866847728 in words is "ninety trillion, eight hundred fifty-five billion, eight hundred sixty-six million, eight hundred forty-seven thousand, seven hundred twenty-eight".