90729169 has 4 divisors (see below), whose sum is σ = 91532196. Its totient is φ = 89926144.

The previous prime is 90729167. The next prime is 90729179. The reversal of 90729169 is 96192709.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15681600 + 75047569 = 3960^2 + 8663^2 .

It is a cyclic number.

It is not a de Polignac number, because 90729169 - 2¹ = 90729167 is a prime.

It is a super-2 number, since 2×90729169² = 16463564214861122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90729167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401344 + ... + 401569.

It is an arithmetic number, because the mean of its divisors is an integer number (22883049).

Almost surely, 2^90729169 is an apocalyptic number.

It is an amenable number.

90729169 is a deficient number, since it is larger than the sum of its proper divisors (803027).

90729169 is a wasteful number, since it uses less digits than its factorization.

90729169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803026.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 90729169 is about 9525.1860349287. The cubic root of 90729169 is about 449.3474806136.

The spelling of 90729169 in words is "ninety million, seven hundred twenty-nine thousand, one hundred sixty-nine".