90404069 has 6 divisors (see below), whose sum is σ = 105163974. Its totient is φ = 77489160.

The previous prime is 90404063. The next prime is 90404089. The reversal of 90404069 is 96040409.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 6315169 = 9170^2 + 2513^2 .

It is not a de Polignac number, because 90404069 - 2¹² = 90399973 is a prime.

It is a super-2 number, since 2×90404069² = 16345791383513522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90404063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 922442 + ... + 922539.

It is an arithmetic number, because the mean of its divisors is an integer number (17527329).

Almost surely, 2^90404069 is an apocalyptic number.

It is an amenable number.

90404069 is a deficient number, since it is larger than the sum of its proper divisors (14759905).

90404069 is a wasteful number, since it uses less digits than its factorization.

90404069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844995 (or 1844988 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90404069 is about 9508.1054369417. The cubic root of 90404069 is about 448.8101389233.

The spelling of 90404069 in words is "ninety million, four hundred four thousand, sixty-nine".