90401817 has 16 divisors (see below), whose sum is σ = 133652160. Its totient is φ = 53889600.

The previous prime is 90401809. The next prime is 90401849. The reversal of 90401817 is 71810409.

It is not a de Polignac number, because 90401817 - 2³ = 90401809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90401807) 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 15 ways as a sum of consecutive naturals, for example, 20442 + ... + 24467.

It is an arithmetic number, because the mean of its divisors is an integer number (8353260).

Almost surely, 2^90401817 is an apocalyptic number.

It is an amenable number.

90401817 is a deficient number, since it is larger than the sum of its proper divisors (43250343).

90401817 is a wasteful number, since it uses less digits than its factorization.

90401817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44984.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 90401817 is about 9507.9870109293. The cubic root of 90401817 is about 448.8064122148.

The spelling of 90401817 in words is "ninety million, four hundred one thousand, eight hundred seventeen".