90784161 has 12 divisors (see below), whose sum is σ = 141219988. Its totient is φ = 55867104.

The previous prime is 90784157. The next prime is 90784201. The reversal of 90784161 is 16148709.

It can be written as a sum of positive squares in 2 ways, for example, as 24443136 + 66341025 = 4944^2 + 8145^2 .

It is not a de Polignac number, because 90784161 - 2² = 90784157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90784121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387850 + ... + 388083.

Almost surely, 2^90784161 is an apocalyptic number.

It is an amenable number.

90784161 is a deficient number, since it is larger than the sum of its proper divisors (50435827).

90784161 is a wasteful number, since it uses less digits than its factorization.

90784161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775952 (or 775949 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 90784161 is about 9528.0722604313. The cubic root of 90784161 is about 449.4382471817.

The spelling of 90784161 in words is "ninety million, seven hundred eighty-four thousand, one hundred sixty-one".