90878336858169 has 81 divisors (see below), whose sum is σ = 156951704852397. Its totient is φ = 50522833505088.

The previous prime is 90878336858123. The next prime is 90878336858327. The reversal of 90878336858169 is 96185863387809.

The square root of 90878336858169 is 9533013.

It is a perfect power (a square), and thus also a powerful number.

90878336858169 is a `hidden beast` number, since 9 + 0 + 8 + 78 + 336 + 8 + 58 + 169 = 666.

90878336858169 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 64779398559225 + 26098938298944 = 8048565^2 + 5108712^2 .

It is not a de Polignac number, because 90878336858169 - 2¹¹ = 90878336856121 is a prime.

It is a super-2 number, since 2×90878336858169² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90878336858669) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 7407144967 + ... + 7407157235.

Almost surely, 2^{90878336858169} is an apocalyptic number.

90878336858169 is the 9533013-rd square number.

90878336858169 is the 4766507-th centered octagonal number.

It is an amenable number.

90878336858169 is a deficient number, since it is larger than the sum of its proper divisors (66073367994228).

90878336858169 is an frugal number, since it uses more digits than its factorization.

90878336858169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24632 (or 12316 counting only the distinct ones).

The product of its (nonzero) digits is 3762339840, while the sum is 81.

The spelling of 90878336858169 in words is "ninety trillion, eight hundred seventy-eight billion, three hundred thirty-six million, eight hundred fifty-eight thousand, one hundred sixty-nine".