90216005 has 16 divisors (see below), whose sum is σ = 123237504. Its totient is φ = 62758080.

The previous prime is 90216001. The next prime is 90216019. The reversal of 90216005 is 50061209.

It is not a de Polignac number, because 90216005 - 2² = 90216001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90216001) 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 15 ways as a sum of consecutive naturals, for example, 34394 + ... + 36923.

It is an arithmetic number, because the mean of its divisors is an integer number (7702344).

Almost surely, 2^90216005 is an apocalyptic number.

It is an amenable number.

90216005 is a deficient number, since it is larger than the sum of its proper divisors (33021499).

90216005 is a wasteful number, since it uses less digits than its factorization.

90216005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71356.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 90216005 is about 9498.2106209538. The cubic root of 90216005 is about 448.4987088930.

Adding to 90216005 its sum of digits (23), we get a triangular number (90216028 = T₁₃₄₃₂).

The spelling of 90216005 in words is "ninety million, two hundred sixteen thousand, five".